As we ease into 2021, here are 21 fun facts related to the number 21. 1 21 in Roman numerals is XXI. 2 21 is a triangle number – it is the sum of the first six whole numbers (1+2+3+4+5+6=21).

The Mega Millions jackpot rose to $324 million for Friday’s drawing after no one won the top prize on Tuesday night. If someone matches all six numbers, they can choose a one-time cash ...