Fatto matematico: 21899 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21899 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: December 15th is the day in 1905 that the Pushkin House is established in St. Petersburg to preserve the cultural heritage of Alexander Pushkin.