# 84221

This number is a prime.

The only prime less than a googol, formed by the first two powers of 2, (2^0, 2^1), from right to left, and with each next number being the product of its two previous numbers. (Starting from 21, next numbers: 2=2*1, 4=2*2, and 8=4*2). [Loungrides]

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