Fait mathématique: 26210 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 26210 is an uninteresting number.
Date historique: October 4th is the day in 1967 that Omar Ali Saifuddin III of Brunei abdicates in favour of his son, His Majesty Sultan Hassanal Bolkiah.