Fatto generale: 2124 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2124 is an unremarkable number.
Trivia: 2124 is an uninteresting number.
Data storica: October 24th is the day in 1930 that a bloodless coup d'état in Brazil ousts Washington Luís Pereira de Sousa, the last President of the First Republic.