What is 73 (number)?
{{Infobox number}} '''73''' ('''seventy-three''') is a positive, odd integer. Sequentially, it comes after [[72 (number)|seventy-two]], but before [[74 (number)|seventy-four]]. 73 is prime and is the 21st prime number. 7 multiplied by 3 is also 21. Its mirror, 37, is also a positive, odd integer prime, and is the 12th prime number, 12 being the mirror of 21. in binary, 73 is a palindrome, 1001001, which backwards is 1001001.{{Math-stub}} [[Category:Integers]] [[Category:Prime numbers]]