12233355555333221

This number is a prime.

1223335 5555333221

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One 1, two 2s, three 3s, five 5s, and back to one 1, is the non-composite-digit palindromic prime. [Marcel]

Submitted: 2026-03-19 16:17:17; Last Modified: 2026-03-20 00:21:57.