17 x 2 = 34

I actually prefer 73... it's the Chuck Norris of the numbers.
The best number is 73. Why? 73 is the 21st prime number. Its mirror (37) is the 12th and its mirror (21) is the product of multiplying 7 and 3. ... In binary, 73 is a palindrome 1001001 which backwards is 1001001.