Fait général: 5223 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 5223 is an unremarkable number.
Culture générale: 5223 is an unremarkable number.
Date historique: April 19th is the day in 1954 that the Constituent Assembly of Pakistan recognises Urdu and Bengali as the national languages of Pakistan.