What is the best number? Btw, there is only one correct answer

Raj: 5,318,008.

Sheldon: Wrong. The best number is 73. 73 is the 21st prime number, it’s mirror, 37, is the 12th, and its mirror, 21, is the product of… hang on to your hats, 7 and 3.

Howard: We get it, 73 is the Chuck Norris of numbers.

Sheldon: Chuck Norris wishes… In binary, 73 is a palindrome, 1001001 which backwards is 1001001, exactly the same. All Chuck Norris backwards gets you is Sirron Kcuhc.

Raj: Just for the record, when you enter 5,318,008 in a calculator, upside down it spells ‘BOOBIES’.