Fatto generale: 16981 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 16981 is an unremarkable number.
Trivia: 16981 is an uninteresting number.
Data storica: June 28th is the day in 1895 that Court of Private Land Claims rules James Reavis' claim to Barony of Arizona is "wholly fictitious and fraudulent".