This listing is for the photographed Palindrome Serial Number 20 Dollar Bill, as pictured. A palindrome is a number that is the same both backwards and forwards. This one is 112242211. 1+1=2, 2+2=4, and the number is the same forwards and backwards. Really really cool note.
Palindrome Note 11244211 - Great Condition - Palindrome Serial Number 20 Dollar Bill 11244211 Repeating, Super Cool Number Sequence