22111

This number is a prime.

This prime cubed contains, in base 10, seven distinct digits (except 2, 4 and 7) each occurring with the same frequency of two. It is the smallest solution in its class P3(7.2). [De Geest]

The square root of 488896321. Note that the reversal of 488896321 is 11122 squared. Truncate the first 2 to get the prime 2111, which has the same square root of reversal of square property. [Post]

Prime formed from the first two digits repeated the first two prime digits times. [Silva]