Fait mathématique: 2211 is a triangular number whose internal digits are triangular and whose external digits are triangular.
Culture générale: 2211 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: January 19th is the day in 1946 that General Douglas MacArthur establishes the International Military Tribunal for the Far East in Tokyo to try Japanese war criminals.