Fait mathématique: 53681 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 53681 is an unremarkable number.
Date historique: December 21st is the day in 1946 that an 8.1 Mw earthquake and subsequent tsunami in Nankaidō, Japan, kill over 1,300 people and destroy over 38,000 homes.