23

This number is a prime.

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Kristen Eller ©2002
+ 230 + 231 + 232 + 233 + 235 = 6449063 and the sum of 6 + 4 + 4 + 9 + 0 + 6 + 3 can be written as 3 * 2 + 2 * 2 + 2 * 2 + 3 * 3 + 0 + 3 * 2 + 3 = 32, the reversal of 23. [Gevisier]

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