General fact: 26921 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 26921 is an unremarkable number.
Trivia: 26921 is an uninteresting number.
Historical date: September 14th is the day in 1985 that Penang Bridge, the longest bridge in Malaysia, connecting the island of Penang to the mainland, opens to traffic.