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 Texas Rangers player, 28, will wear number 21 for the 2025 season in honor of his daughter Penelope, who was born with ...
The clinical name for Down syndrome is trisomy 21, a condition in which a person is born with an extra chromosome, causing ...