##### Table of Contents



United States
 Securities and Exchange Commission
 Washington, D.C. 20549
 Form 10-Q
  þ
    
    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934
 For the quarterly period ended June 30, 2010
 o
    
    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934
 For the transition period from  to
 Commission file number 333-150925-01
 ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
  Delaware
    
    27-0213766(State or other jurisdiction of
    
    (I.R.S. Employerincorporation or organization)
    
    Identification No.)Westpointe Corporate Center One1550 Coraopolis Heights Rd. 2nd FloorMoon Township, PA
    
    15108(Address of principal executive offices)
    
    (zip code)
 (412) 262-2830
 þ o
 Yes o No o
  Large accelerated filer o
    
    Accelerated filer o
    
    Non-accelerated filer o
    
    Smaller reporting company þ
 o þ




---



##### 



ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
(A Delaware Limited Partnership)
INDEX TO QUARTERLY REPORT
ON FORM 10-Q
 PAGEPART I. FINANCIAL INFORMATIONItem 1: Financial StatementsBalance Sheets as of June 30, 2010 and December 31, 2009
    
    
    3Statements of Operations for the Three Months and Six Months ended June 30, 2010
    
    
    4Statement of Changes in Partners Capital for the Six Months ended June 30, 2010
    
    
    5Statement of Cash Flows for the Six Months ended June 30, 2010
    
    
    6Notes to Financial Statements
    
    
    7-16Item 2: Managements Discussion and Analysis of Financial Condition and Results of Operations
    
    
    16-19Item 4: Controls and Procedures
    
    
    19-20PART II. OTHER INFORMATIONItem 1: Legal Proceedings
    
    
    20Item 6: Exhibits
    
    
    20SIGNATURES
    
    
    21CERTIFICATIONSExhibit 31.1Exhibit 31.2Exhibit 32.1Exhibit 32.2
   2




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
 
 BALANCE SHEETS
 June 30,
    
    
    December 31,2010
    
    
    2009(Unaudited)ASSETSCurrent assets:Cash and cash equivalents
    
    $
    2,946,600
    
    
    $
    26,313,800Accounts receivable  affiliate
    
    
    9,768,800
    
    
    
    1,219,300Short-term hedge receivable due from affiliate
    
    
    4,382,200
    
    
    
    3,639,400Total current assets
    
    
    17,097,600
    
    
    
    31,172,500Oil and gas properties, net
    
    
    221,383,000
    
    
    
    70,652,900Construction in progress
    
    
    19,332,000
    
    
    
    122,532,400Long-term hedge receivable due from affiliate
    
    
    6,055,600
    
    
    
    3,340,600$
    263,868,200
    
    
    $
    227,698,400LIABILITIES AND PARTNERS CAPITALCurrent liabilities:Accrued liabilities
    
    $
    332,500
    
    
    $
    24,900Short-term hedge liability due to affiliate
    
    
    72,300
    
    
    
    45,300Total current liabilities
    
    
    404,800
    
    
    
    70,200Asset retirement obligation
    
    
    1,273,200
    
    
    
    1,152,700Long-term hedge liability due to affiliate
    
    
    1,720,100
    
    
    
    548,700Partners capital:Managing general partner
    
    
    20,920,800
    
    
    
    10,510,800Investor subscription receivable
    
    
    
    
    
    
    (20,187,700
    )Investor partners (22,928.90 units)
    
    
    230,903,900
    
    
    
    229,217,700Accumulated other comprehensive income
    
    
    8,645,400
    
    
    
    6,386,000Total partners capital
    
    
    260,470,100
    
    
    
    225,926,800$
    263,868,200
    
    
    $
    227,698,400
   3




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
 
 STATEMENTS OF OPERATIONS
 (Unaudited)
 Three Months
    
    
    Six MonthsEnded
    
    
    EndedJune 30,
    
    
    June 30,2010
    
    
    2010REVENUESNatural gas and oil
    
    $
    9,734,100
    
    
    $
    15,316,000Interest income
    
    
    600
    
    
    
    600Total revenues
    
    
    9,734,700
    
    
    
    15,316,600COSTS AND EXPENSESProduction
    
    
    2,523,500
    
    
    
    4,066,200Depletion
    
    
    4,616,000
    
    
    
    7,351,100Accretion of asset retirement obligation
    
    
    18,600
    
    
    
    37,100General and administrative
    
    
    37,100
    
    
    
    61,800Total expenses
    
    
    7,195,200
    
    
    
    11,516,200Net earnings
    
    $
    2,539,500
    
    
    $
    3,800,400Allocation of net earnings:Managing general partner
    
    $
    1,430,100
    
    
    $
    2,162,500Limited partners
    
    $
    1,109,400
    
    
    $
    1,637,900Net earnings per limited partnership unit
    
    $
    48
    
    
    $
    71
   4




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
 
 STATEMENT OF CHANGES IN PARTNERS CAPITAL
 FOR THE SIX MONTHS ENDED
 June 30, 2010
 (Unaudited)
 AccumulatedManaging
    
    
    
    
    
    
    Investor
    
    
    OtherGeneral
    
    
    Investor
    
    
    Subscription
    
    
    ComprehensivePartner
    
    
    Partners
    
    
    Receivable
    
    
    Income
    
    
    TotalBalance at January 1, 2010
    
    $
    10,510,800
    
    
    $
    229,217,700
    
    
    $
    (20,187,700
    )
    
    $
    6,386,000
    
    
    $
    225,926,800Participation in revenues and expenses:Net production revenues
    
    
    2,924,900
    
    
    
    8,324,900
    
    
    
    
    
    
    
    
    
    
    
    11,249,800Interest income
    
    
    200
    
    
    
    400
    
    
    
    
    
    
    
    
    
    
    
    600Depletion
    
    
    (736,800
    )
    
    
    (6,614,300
    )
    
    
    
    
    
    
    
    
    
    
    (7,351,100
    )Accretion of asset retirement obligation
    
    
    (9,700
    )
    
    
    (27,400
    )
    
    
    
    
    
    
    
    
    
    
    (37,100
    )General and administrative
    
    
    (16,100
    )
    
    
    (45,700
    )
    
    
    
    
    
    
    
    
    
    
    (61,800
    )Net earnings
    
    
    2,162,500
    
    
    
    1,637,900
    
    
    
    
    
    
    
    
    
    
    
    3,800,400Other comprehensive income
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    2,259,400
    
    
    
    2,259,400Asset contributions
    
    
    8,295,900
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    8,295,900Working interest adjustment
    
    
    (48,300
    )
    
    
    48,300
    
    
    
    
    
    
    
    
    
    
    
    Initial capital contribution returned
    
    
    (100
    )
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    (100
    )Subscription received
    
    
    
    
    
    
    
    
    
    
    20,187,700
    
    
    
    
    
    
    
    20,187,700Balance at June 30, 2010
    
    $
    20,920,800
    
    
    $
    230,903,900
    
    
    $
    
    
    
    $
    8,645,400
    
    
    $
    260,470,100
   5




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
 
 STATEMENT OF CASH FLOWS
 (Unaudited)
 Six Months EndedJune 30,2010Cash flows from operating activities:Net earnings
    
    $
    3,800,400Adjustments to reconcile net earnings to net cash provided by operating activities:Depletion
    
    
    7,351,100Accretion of asset retirement obligation
    
    
    37,100Increase in accounts receivable-affiliate
    
    
    (8,549,500
    )Increase in accrued liabilities
    
    
    307,600Net cash provided by operating activities
    
    
    2,946,700Cash flows from investing activities:Oil and gas well drilling contract paid to MGP
    
    
    (46,501,500
    )Net cash provided by operation activities
    
    
    (46,501,500
    )Cash flows from financing activities:Initial capital contribution by MGP
    
    
    (100
    )Partners capital contribution
    
    
    20,187,700Net cash used in financing activities
    
    
    20,187,600Net decrease in cash and cash equivalents
    
    
    (23,367,200
    )Cash and cash equivalents at beginning of period
    
    
    26,313,800Cash and cash equivalents at end of period
    
    $
    2,946,600Supplemental Schedule of non-cash investing and financing activities:Assets contributed by managing general partner:Tangible drilling costs
    
    $
    7,326,100Lease costs
    
    
    969,800$
    8,295,900Asset retirement obligation
    
    $
    83,400
   6




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
 
 NOTES TO FINANCIAL STATEMENTS
 June 30, 2010
 (Unaudited)
 NOTE 1  BASIS OF PRESENTATION
   NOTE 2  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 Use of Estimates
   Fair Value of Financial Instruments
   7




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 2  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)
 Oil and Gas Properties
    Impairment of Long-Lived Assets
      8




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 2  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)
 Working Interest
  Revenue Recognition
    9




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 2  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)
 Comprehensive Income
  Three Months
    
    
    Six MonthsEnded
    
    
    EndedJune 30,
    
    
    June 30,2010
    
    
    2010Net earnings
    
    $
    2,539,500
    
    
    $
    3,800,400Other comprehensive income (loss):Unrealized holding gain on hedging contracts
    
    
    69,400
    
    
    
    4,742,100Less: reclassification adjustment for gains
realized in net earnings
    
    
    (2,112,800
    )
    
    
    (2,482,700
    )Total other comprehensive income (loss)
    
    
    (2,043,400
    )
    
    
    2,259,400Comprehensive income
    
    $
    496,100
    
    
    $
    6,059,800
 Recently Adopted Accounting Standards
     10




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 2  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Continued)
 Recently Issued Accounting Standards
  NOTE 3  OIL AND GAS PROPERTIES
  June 30,
    
    
    December 31,2010
    
    
    2009Natural gas and oil properties:Proved properties:Leasehold interests
    
    $
    3,217,800
    
    
    $
    2,248,000Wells and related equipment
    
    
    226,228,200
    
    
    
    69,116,800229,446,000
    
    
    
    71,364,800Accumulated depletion
    
    
    (8,063,000
    )
    
    
    (711,900
    )$
    221,383,000
    
    
    $
    70,652,900
 NOTE 4  ASSET RETIREMENT OBLIGATIONS
    11




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 4  ASSET RETIREMENT OBLIGATIONS (Continued)
  Three Months
    
    
    Six MonthsEnded
    
    
    EndedJune 30,
    
    
    June 30,2010
    
    
    2010Asset retirement obligation at beginning of period
    
    $
    1,254,600
    
    
    $
    1,152,700Liabilities incurred from drilling wells
    
    
    
    
    
    
    83,400Accretion expense
    
    
    18,600
    
    
    
    37,100Asset retirement obligation at end of period
    
    $
    1,273,200
    
    
    $
    1,273,200
 NOTE 5  DERIVATIVE INSTRUMENTS
     12




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 5  DERIVATIVE INSTRUMENTS (Continued)
  Fair Value of Derivative Instruments:
 Asset Derivatives
    
    
    Liability DerivativesDerivatives in
    
    
    
    Fair Value
    
    
    
    
    Fair ValueCash Flow
    
    Balance Sheet
    
    June 30,
    
    
    December 31,
    
    
    Balance Sheet
    
    June 30,
    
    
    December 31,Hedging Relationships
    
    Location
    
    2010
    
    
    2009
    
    
    Location
    
    2010
    
    
    2009Commodity contracts:
    
    Current assets
    
    $
    4,382,200
    
    
    $
    3,639,400
    
    
    Current liabilities
    
    $
    (72,300
    )
    
    $
    (45,300
    )Long-term assets
    
    
    6,055,600
    
    
    
    3,340,600
    
    
    Long-term liabilities
    
    
    (1,720,100
    )
    
    
    (548,700
    )Total derivatives
    
    
    
    $
    10,437,800
    
    
    $
    6,980,000
    
    
    
    
    $
    (1,792,400
    )
    
    $
    (594,000
    )
 Effects of Derivative Instruments on Statements of Operations:
 Gain
    
    
    
    
    GainRecognized in OCI
    
    
    
    
    Reclassified from OCI intoon Derivative
    
    
    Location of Gain
    
    Income(Effective Portion)
    
    
    Reclassified from
    
    (Effective Portion)Derivatives in
    
    Three Months Ended
    
    
    Accumulated
    
    Three Months EndedCash Flow
    
    June 30,
    
    
    OCI into Income
    
    June 30,Hedging Relationships
    
    2010
    
    
    (Effective Portion)
    
    2010Commodity contracts:
    
    $
    69,400
    
    
    Natural gas and oil revenue
    
    $
    2,112,800
 Gain
    
    
    
    
    GainRecognized in OCI
    
    
    
    
    Reclassified from OCI intoon Derivative
    
    
    Location of Gain
    
    Income(Effective Portion)
    
    
    Reclassified from
    
    (Effective Portion)Derivatives in
    
    Six Months Ended
    
    
    Accumulated
    
    Six Months EndedCash Flow
    
    June 30,
    
    
    OCI into Income
    
    June 30,Hedging Relationships
    
    2010
    
    
    (Effective Portion)
    
    2010Commodity contracts:
    
    $
    4,742,100
    
    
    Natural gas and oil revenue
    
    $
    2,482,700
   13




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 5  DERIVATIVE INSTRUMENTS (Continued)
 Natural Gas Fixed Price Swaps
 Production
    
    
    
    
    
    AveragePeriod Ending
    
    Volumes
    
    
    Fixed Price
    
    
    Fair ValueDecember 31,
    
    (MMbtu) (1)
    
    
    (per MMbtu) (1)
    
    
    Asset (2)2010
    
    
    1,004,600
    
    
    $
    7.245
    
    
    $
    2,452,0002011
    
    
    1,303,500
    
    
    
    6.850
    
    
    
    2,012,2002012
    
    
    1,055,600
    
    
    
    7.165
    
    
    
    1,537,1002013
    
    
    684,400
    
    
    
    7.022
    
    
    
    763,7002014
    
    
    
    
    
    
    
    
    
    
    $
    6,765,000
 Natural Gas Costless Collars
 Production
    
    
    
    
    
    
    
    AveragePeriod Ending
    
    Option
    
    Volumes
    
    
    Floor & Cap
    
    
    Fair ValueDecember 31,
    
    Type
    
    (MMbtu) (1)
    
    
    (per MMbtu) (1)
    
    
    Asset (Liability) (2)2010
    
    Puts purchased
    
    
    127,200
    
    
    $
    6.170
    
    
    $
    237,3002010
    
    Calls sold
    
    
    127,200
    
    
    
    7.373
    
    
    
    (16,100
    )2011
    
    Puts purchased
    
    
    696,500
    
    
    
    6.443
    
    
    
    1,135,9002011
    
    Calls sold
    
    
    696,500
    
    
    
    7.554
    
    
    
    (199,800
    )2012
    
    Puts purchased
    
    
    550,600
    
    
    
    6.024
    
    
    
    832,0002012
    
    Calls sold
    
    
    550,600
    
    
    
    7.192
    
    
    
    (448,700
    )2013
    
    Puts purchased
    
    
    633,400
    
    
    
    6.020
    
    
    
    1,073,4002013
    
    Calls sold
    
    
    633,400
    
    
    
    7.183
    
    
    
    (758,800
    )2014
    
    Puts purchased
    
    
    229,300
    
    
    
    5.862
    
    
    
    385,9002014
    
    Calls sold
    
    
    229,300
    
    
    
    6.963
    
    
    
    (360,700
    )$
    1,880,400Total Net Asset
    
    
    $
    8,645,400
 
 (1)
    
    MMBTU represents million British Thermal Units. Bbl represents barrels.(2)
    
    Fair value based on forward NYMEX natural gas prices, as applicable.(3)
    
    Fair value based on forward WTI crude oil prices, as applicable. NOTE 6  FAIR VALUE OF FINANCIAL INSTRUMENTS
  Level 1 
  14




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 6  FAIR VALUE OF FINANCIAL INSTRUMENTS (Continued)
 Level 2 
 Level 3 
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
  Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
  NOTE 7  CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS
  
    
    Drilling contracts to drill and complete wells for the Partnership are charged at
cost plus 18%. The cost of the wells includes reimbursement to the Partnerships MGP of
its general and administrative overhead cost. The Partnership paid $46,501,500 to its
MGP for the six months ended June, 30, 2010.
 
    
    The Partnerships MGP contributed undeveloped leases necessary to cover each of the
Partnerships prospects and at June 30, 2010 received a credit to its capital account in
the Partnership of $969,800.
 
    
    Administrative costs which are included in general and administrative expenses in the
Partnerships statements of operations are payable at $75 per well per month.
Administrative costs incurred for the three months and six months ended June 30, 2010
were $16,000 and $27,500, respectively.
  15




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ATLAS RESOURCES PUBLIC 18-2009 (C) L.P.
NOTES TO FINANCIAL STATEMENTS (Continued)
June 30, 2010
(Unaudited)
 NOTE 7  CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS (continued)
 
    
    Monthly well supervision fees which are included in production expenses in the
Partnerships statements of operations are payable at $975 per well, per month for
Marcellus wells, $1,500 per well, per month for New Albany and Indiana Wells, and $600
per well, per month for horizontal Antrim Shale wells. For all other wells a fee of $392
is charged per well, per month, for operating and maintaining the wells. Well
supervision fees incurred for the three months and six months ended June 30, 2010 were
$227,400 and $359,600, respectively.
 
    
    Transportation fees which are included in production expenses in the Partnerships
statements of operations are generally payable at 13% of the natural gas sales price.
Transportation fees incurred for the three months and six months ended June 30, 2010
were $1,015,800 and $1,647,700, respectively.
 
    
    Assets contributed from the MGP which are disclosed on the Partnerships statement of
cash flows as a non-cash activity for the six months ended June 30, 2010 were
$8,295,900.
  Subordination by Managing General Partner
  NOTE 8  COMMITMENTS AND CONTINGENCIES
 Legal Proceedings
   
 ITEM 2.
    
    MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
RESULTS OF OPERATIONS (UNAUDITED)
 Forward-Looking Statements
 When used in this Form 10-Q , the words believes, anticipates, expects and similar
expressions are intended to identify forward-looking statements. There are risks and uncertainties
that could cause actual results to differ materially from the results stated or implied in this
document. Readers are cautioned not to place undue reliance on these forward-looking statements,
which speak only as of the date hereof. We undertake no obligation to publicly release the results
of any revisions to forward-looking statements which we may make to reflect events or circumstances
after the date of this Form 10-Q or to reflect the occurrence of unanticipated events.
  16




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BUSINESS OVERVIEW
   Results of Operations
  Three Months
    
    
    Six MonthsEnded
    
    
    EndedJune 30,
    
    
    June 30,2010
    
    
    2010Production revenues (in thousands):Gas
    
    $
    9,730
    
    
    $
    15,312Oil
    
    
    3
    
    
    
    3Liquid
    
    
    1
    
    
    
    1Total
    
    $
    9,734
    
    
    $
    15,316Production volumes:Gas (mcf/day) (1)
    
    
    16,732
    
    
    
    13,215Oil (bbls/day) (1) (3)
    
    
    
    
    
    
    Liquid (bbl/day) (1)
    
    
    1
    
    
    
    Total (mcfe/day) (1)
    
    
    16,738
    
    
    
    13,215Average sales prices: (2)Gas (per mcf) (1)
    
    $
    6.39
    
    
    $
    6.40Oil (per bbl) (1)
    
    $
    57.42
    
    
    $
    57.42Liquid (per bbl) (1)
    
    $
    17.55
    
    
    $
    17.55Average production costs:As a percent of revenues
    
    
    26
    %
    
    
    27
    %Per mcfe (1)
    
    $
    1.66
    
    
    $
    1.70Depletion per mcfe
    
    $
    3.03
    
    
    $
    3.07
 (1)
    
    Mcf represents thousand cubic feet, mcfe represents thousand cubic feet
equivalent, and bbls represents barrels. Bbls are converted to mcfe using the ratio
of six mcfs to one bbl. Liquid gallons are converted into bbls by a ratio of 42 gallons
per bbl.(2)
    
    Average sales prices represent accrual basis pricing after reversing the effect
of previously recognized gains resulting from prior period impairment charges.(3)
    
    Oil barrels per day are less than 1 bbl.  17




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Natural Gas Revenues
 Oil Revenues
 Natural Gas Liquids Revenue
 Expenses.
   Liquidity and Capital Resources
     Subordination by Managing General Partner
   18




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CRITICAL ACCOUNTING POLICIES AND ESTIMATES
  Fair Value of Financial Instruments
  Level 1 
 Level 2 
 Level 3 
   
 ITEM 4. CONTROLS AND PROCEDURES
   19




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PART II OTHER INFORMATION
 
 ITEM 1. LEGAL PROCEEDINGS
   
 ITEM 6. EXHIBITS
 
 EXHIBIT INDEX
 Exhibit No.
    
    Description4.0
    
    
    Amended and Restated Certificate and Agreement of Limited Partnership for Public 18-2009 (C) L.P. (1)10.1
    
    
    Drilling and Operating Agreement for Atlas America Public 18-2009 (C) L.P. (1)31.1
    
    
    Rule 13a-14(a)/15d-14(a) Certification.31.2
    
    
    Rule 13a-14(a)/15d-14(a) Certification.32.1
    
    
    Section 1350 Certification.32.2
    
    
    Section 1350 Certification.
 
 (1)
    
    Filed on October 15, 2008 in the Form S-1A Registration Statement dated October 15, 2008, File No. 333-150925-01  20




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##### Table of Contents



SIGNATURES
  Atlas Resources Public 18-2009 (C) L.P.Atlas Resources, LLC, Managing General PartnerDate: August 16, 2010
    
    By:
    
    /s/ FREDDIE M. KOTEK

Freddie M. KotekChairman of the Board of Directors,Chief Executive Officer and PresidentDate: August 16, 2010
    
    By:
    
    /s/ MATTHEW A. JONES

Matthew A. JonesChief Financial Officer
  21