Factorial of 22 has a beautiful property. When you calculate 22! you get 1124000727777607680000, a 22-digit number. In other words, 22! is a number or the number of digits of n! equals n. Don’t you think it is really cool!

Factorial of 22 has a beautiful property. When you calculate 22! you get 1124000727777607680000, a 22-digit number. In other words, 22! is a number or the number of digits of n! equals n. Don’t you think it is really cool!