Consider the following: September 11. May 1, 2011. (September) 11x20(11)=121. 11x11=121. May 1st is the 121st day of the year.

?3,521 days passed between September 11, 2001 and May 5, 2011. 3,516 people died in the 9/11 attack in which 4 planes were hijacked under the instruction of 1 Osama Bin Laden (dead lololol). 3,516+4+1=3,521.