Fait général: 21431 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21431 is a boring number.
Culture générale: 21431 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: September 3rd is the day in 301 that San Marino, one of the smallest nations in the world and the world's oldest republic still in existence, is founded by Saint Marinus.