Number #122121LEGENDARY

First 2 digits mirror the last 2 digits (e.g. 42xx24)

Contains at least 3 identical digits (e.g. 777124)

Three of one digit and three of another (or 3 and 2)

Digits composed strictly of 0, 1, and 2

Only 2 unique digit types across all 6 positions

Every digit belongs to Fibonacci {0, 1, 2, 3, 5, 8}