Fatto matematico: 1021 is a value of n for which one more than the product of the first n primes is prime.
Trivia: 1021 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: October 17th is the day in 1907 that Guglielmo Marconi's company begins the first commercial transatlantic wireless service between Glace Bay, Nova Scotia, Canada and Clifden, Ireland.