21, “Red-haired” Shanks cutting off his arm (character from One Piece) in my system ^^
Blackjack, our century (21st), 21-gun salute, and the weight of the soul as researched by Duncan MacDougall! Though that research is regarded bollocks, speaking of which… “bollocks” is a word meaning testicles, of which men generally have two, accompanied by one… yea, you get it, moving on! The 9th fibonacci number and the 13th Padovan number. In several countries it is the age of maturity and it is the sum of all sides of a standard dice. It is a palindrome in binary, 10101, and the atomic number of Scandium.