Fait général: 23570 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 23570 is a boring number.
Culture générale: 23570 is an unremarkable number.
Date historique: July 12th is the day in 1493 that Hartmann Schedel's Nuremberg Chronicle, one of the best-documented early printed books, is published.