Fatto generale: 21323 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21323 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 21323 is an unremarkable number.
Data storica: May 18th is the day in 1783 that First United Empire Loyalists reach Parrtown (later called Saint John), New Brunswick, Canada after leaving the United States.