Trillion

A trillion is equal to 1012 in the short scale, or 1018 in the long scale.Cambridge Dictionary TrillionLarousse (French dictionary) Trillion (source for long scale in French)Conway and Guy. The Book of Numbers. Copernicus. 1995. ISBN 978-0387979939 p.16Trillion at Wolfram MathWorld
Written out in decimal form trillion (in the short scale) is:
In long scale:
== Alternative names ==
This number is also called tetrillion in Russ Rowlett's Greek-based naming system.Russ Rowlett　Names for Large Numbers　Archived 2006-01-10.
Aarex Tiaokhiao gave the name tetillion, referring to the value of this number.Aarex Tiaokhiao's illion numbers He also calls 1012 dudoocol, 12-noogolPart 1 (LAN) - Aarex Googology (archived 2017-02-25), or goonaoldecault, and it's equal to a(10,100,0)x[10] in Aarex's Array Notation.AAN Numbers - P1 - Aarex Googology
Wikia user NumLynx gave the name quadrasand for this number's short scale value.
Nicolas Chuquet coined byllion for 1018 (not to be confused with 1016), according to the Triparty en la science des nombres, which was previously lost and not rediscovered until 1880.Olivier Miakinen, Grands nombres : 1270-1961, sept siècles d'histoire in Écriture des nombres en français. 1 May 2004Robert Munafo, Origins of the Chuquet Number Names Later it became billion in long scale.
Username5243 gave the name niloogolnoniplex, referring to the short scale value of this number.Part 1 - My Large Numbers
BlankEntity calls this number Joogol.BlankEntity's Googology Site
Alistair Cockburn coined gar-million for this number, referring to the quote below,A Fuga Really Big Numbers. Archived 2016-04-11. and it's equal to gar(1,000,000) = 1,000,0002.
CompactStar gave the name tryriad for this number as part of the -yriad system, referring to it being myriad3.-yriad numbers. Retrieved Apr 21, 2023 
== Examples ==
* It is the first -illion to exceed 1010 in the short scale.
* It is equal to 1 million squared in the short scale and 1 million cubed in the long scale.
* The nearest star to the Earth (besides the sun), Alpha Centauri, is over 26 trillion miles away or 41.842 trillion kilometers away.
* The human body contains somewhere around 50 trillion cells.
* There are roughly 3,500,000,000,000 fish in the world.
* The SI prefix tera- multiplies by one trillion.
* If one sandcastle contains one million grains of sand then you could make one million sandcastles with 1 trillion grains of sand.
* 1 trillion flops or operations per second is called a teraflop.
* A 2016 estimate says there are 2,000,000,000,000 galaxies in the observable universe.
* An estimate says there were 3.04 × 1012 trees on Earth in 2015.
* Andromeda Galaxy, which is part of the same Local Group as our galaxy, contains about 1012 stars.
* The surface of the human body houses roughly 1012 bacteria.
* 1.9786782 × 1012 is a rough estimate of the total number of links on Wikipedia.
* 1013 (ten Trillion)– The approximate number of known non-trivial zeros of the Riemann zeta function as of 2004.
* As of 2021, the number of known digits of π is 50,000,000,000,000 (5×1013).
* Approximately 1014 (one hundred Trillion) synapses in the human brain.
* 281,474,976,710,656 (248) possible unique physical addresses on MAC-48.
* 953,467,954,114,363 is the largest known Motzkin prime.
* There are 2 trillion galaxies in the observable universe.
* There are 3 trillion trees in the world.
* Some villains (usually extremely powerful ones) have killed trillions of people. 
=== As a banknote denomination ===
Some currencies, such as the and the , had banknotes with this number in the denomination.
==Approximations==
For short scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{12}\) 	\(1\times10^{12}\)
Arrow notation 	\(10\uparrow12\) 	\(10\uparrow12\)
Steinhaus-Moser Notation 	11[3] 	12[3]
Copy notation 	9[12] 	1[13]
Chained arrow notation 	\(10\rightarrow12\) 	\(10\rightarrow12\)
Taro's multivariable Ackermann function	A(3,36) 	A(3,37)
Pound-Star Notation 	#*(4,2,3)*4 	#*(1,2)*8
BEAF & Bird's array notation 	{10,12} 	{10,12}
Hyper-E notation 	E12 	E12
Bashicu matrix system 	(0)(0)[1000] 	(0)(0)[1000]
Hyperfactorial array notation 	14! 	15!
Fast-growing hierarchy 	\(f_2(34)\) 	\(f_2(35)\)
Hardy hierarchy 	\(H_{\omega^2}(34)\) 	\(H_{\omega^2}(35)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega+2}}(10)\)	\(g_{\omega^{\omega+2}}(10)\)
For long scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{18}\) 	\(1\times10^{18}\)
Arrow notation 	\(10\uparrow18\) 	\(10\uparrow18\)
Steinhaus-Moser Notation 	15[3] 	16[3]
Copy notation 	9[18] 	1[19]
Chained arrow notation 	\(10\rightarrow18\) 	\(10\rightarrow18\)
Taro's multivariable Ackermann function	A(3,56) 	A(3,57)
Pound-Star Notation 	#*(4,1,3)*6 	#*(3,1)*13
BEAF & Bird's array notation 	{10,18} 	{10,18}
Hyper-E notation 	E18 	E18
Bashicu matrix system 	(0)(0)[31622] 	(0)(0)[31623]
Hyperfactorial array notation 	19! 	20!
Fast-growing hierarchy 	\(f_2(54)\) 	\(f_2(55)\)
Hardy hierarchy 	\(H_{\omega^2}(54)\) 	\(H_{\omega^2}(55)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega+8}}(10)\)	\(g_{\omega^{\omega+8}}(10)\)
== Gallery ==
Trillion.jpeg|Trillion dollars visualised.
10 Trillion Dollars.jpg|10 trillion dollars
100 Trillion Dollars.jpg|100 trillion dollars in 100 dollar bills, in comparison to the Empire State Building
== Sources ==
== See also ==
*tryllion
Category:Numbers
Category:Banknote denominations
Category:Base Illion
Category:Class 2
Category:Illion
Category:Numbers with 7 to 29 digits
Category:Tier 1 -illion numbers
Category:Googol Regiment
Category:Numbers with peer-reviewed source
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