What is 73?

73 is a positive integer. It is an odd number and a composite number. Its prime factorization is 3 x 73. 73 is the 21st prime number. It is also a prime number of the form 3p+2. The sum of its digits (7 + 3) is 10, and its digital root is 1. In binary code, 73 is represented as 1001001. In ASCII code, it represents the letter 'I'. 73 is a palindromic number because it reads the same from left to right and right to left. It is also a lucky number in some cultures and beliefs.