This number is a prime.
(2 * 2521) - 1 = 712 and 2 * (2521 - 1) = 7!. [Forslund]
2521 minus one is the smallest EPRN.
25212 = 14563 - 14553, i.e., one solution to the Diophantine equation z2 = x3 - y3. A Diophantine equation is a polynomial equation in which only integer solutions are allowed. These are named after the Greek algebraist Diophantus who lived in the 3rd century. [Mizuki]
The smallest prime formed by concatenating consecutive
composite odd numbers. [Green]
The smallest prime that can be represented as the product of a number n and its reversal plus 1, in two ways, (n=120 and n=210). [Loungrides]
The smallest prime p such that p ≡ 1 mod
d , where d stands for any of the digits 2
through 9. [Beedassy]
(There are 5 curios for this number that have not yet been approved by an editor.)
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