251021132505153 has 12 divisors (see below), whose sum is σ = 374282405456128. Its totient is φ = 161949117745080.

The previous prime is 251021132505103. The next prime is 251021132505173. The reversal of 251021132505153 is 351505231120152.

251021132505153 is a `hidden beast` number, since 2 + 5 + 1 + 0 + 2 + 1 + 132 + 5 + 0 + 515 + 3 = 666.

It is not a de Polignac number, because 251021132505153 - 2³³ = 251012542570561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251021132505103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 449858660125 + ... + 449858660682.

Almost surely, 2^{251021132505153} is an apocalyptic number.

It is an amenable number.

251021132505153 is a deficient number, since it is larger than the sum of its proper divisors (123261272950975).

251021132505153 is a wasteful number, since it uses less digits than its factorization.

251021132505153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899717320844 (or 899717320841 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 251021132505153 in words is "two hundred fifty-one trillion, twenty-one billion, one hundred thirty-two million, five hundred five thousand, one hundred fifty-three".