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 1763 that a massive earthquake occurs on the same day in Komárom in Hungary, in Komárno in Slovakia and in Zsámbék in Hungary.