Fait général: 21426 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21426 is a boring number.
Culture générale: 21426 is a boring number.
Date historique: August 29th is the day in 1930 that the last 36 remaining inhabitants of St Kilda are voluntarily evacuated to other parts of Scotland.