Fatto generale: 21079 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21079 is an unremarkable number.
Trivia: 21079 is an uninteresting number.
Data storica: September 16th is the day in 1963 that Malaysia is formed from the Federation of Malaya, Singapore, British North Borneo (Sabah) and Sarawak.