The duodecimal system (also known as base 12 or dozenal) is a positional notation numeral system using twelve as its base.
base 22
base 22 is a positional numeral system with twenty-two as its base. It uses 22 different digits for representing numbers. The digits for base 22 could be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, g, h, i, j, k, and l.