Fatto generale: 83217 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 83217 is an uninteresting number.
Trivia: 83217 is an uninteresting number.
Data storica: November 3rd is the day in 1333 that the River Arno flooding causing massive damage in Florence as recorded by the Florentine chronicler Giovanni Villani.