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).

U.S. stock-market futures hit session lows shortly before the opening bell as investors received the latest weekly update on the number of Americans receiving unemployment benefits. While the number o ...

Practically everybody in the United States, it seems. A 2021 report finds that the number of millionaires in the U.S. has reached nearly 22 million. The number of multimillionaires has also ...