73 T-Shirt From Sheldon's Closet as seen on The Big Bang Theory Black Large

"The best number is 73.... 73 is the twenty-first prime number. Its mirror, 37, is the twelfth and its mirror, 21, is the product of multiplying (hang on to your hats) 7 and 3.... In binary, 73 is a palindrome: 1-0-0-1-0-0-1, which backwards is 1-0-0-1-0-0-1." -Sheldon. Now you, Big Bang Theory fans, and math lovers can wear the Chuck Norris of numbers on your shirt and embody Sheldon's quirky love of all that is 73!