Question: when did the last episode of naruto shippuden air
Answer: 07 - 04 ) 15 28 July 18 , 2013 ( 2013 - 07 - 18 ) January 30 , 2014 ( 2014 - 01 - 30 ) 16 13 February 6 , 2014 ( 2014 - 02 - 06 ) May 8 , 2014 ( 2014 - 05 - 08 ) 17 11 May 15 , 2014 ( 2014 - 05 - 15 ) August 14 , 2014 ( 2014 - 08 - 14 ) 18 21 August 21 , 2014 ( 2014 - 08 - 21 ) December 25 , 2014 ( 2014 - 12 - 25 ) 19 20 January 8 , 2015 ( 2015 - 01 - 08 ) May 21 , 2015 ( 2015 - 05 - 21 ) 20 66 May 28 , 2015 ( 2015 - 05 - 28 ) October 13 , 2016 ( 2016 - 10 - 13 ) 21 21 October 20 , 2016 ( 2016 - 10 - 20 ) March 23 , 2017 ( 2017 - 03 - 23 )