Fait mathématique: 2371 is the number of ways a 7×1 rectangle can be surrounded by 7×1 rectangles.
Culture générale: 2371 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: June 28th is the day in 1948 that the Cominform circulates the "Resolution on the situation in the Communist Party of Yugoslavia"; Yugoslavia is expelled from the Communist bloc.