Fatto matematico: 21470 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21470 is a boring number.
Data storica: October 12th is the day in 1960 that Inejiro Asanuma, Chair of the Japanese Socialist Party, is assassinated in Japan by Otoya Yamaguchi, a 17-year-old.