Fatto generale: 21458 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21458 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21458 is an unremarkable number.
Data storica: September 30th is the day in 1791 that the National Constituent Assembly in Paris is dissolved; Parisians hail Maximilien Robespierre and Jérôme Pétion as "incorruptible patriots".