251241255321 has 16 divisors (see below), whose sum is σ = 383551494528. Its totient is φ = 143301052800.

The previous prime is 251241255271. The next prime is 251241255347. The reversal of 251241255321 is 123552142152.

It is not a de Polignac number, because 251241255321 - 2⁷ = 251241255193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251241255371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11045820 + ... + 11068541.

It is an arithmetic number, because the mean of its divisors is an integer number (23971968408).

Almost surely, 2^251241255321 is an apocalyptic number.

251241255321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

251241255321 is a deficient number, since it is larger than the sum of its proper divisors (132310239207).

251241255321 is a wasteful number, since it uses less digits than its factorization.

251241255321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22114912.

The product of its digits is 24000, while the sum is 33.

Adding to 251241255321 its reverse (123552142152), we get a palindrome (374793397473).

The spelling of 251241255321 in words is "two hundred fifty-one billion, two hundred forty-one million, two hundred fifty-five thousand, three hundred twenty-one".