251221252121139 has 32 divisors (see below), whose sum is σ = 337026077856000. Its totient is φ = 166449725840384.

The previous prime is 251221252121107. The next prime is 251221252121201. The reversal of 251221252121139 is 931121252122152.

It is a cyclic number.

It is not a de Polignac number, because 251221252121139 - 2⁵ = 251221252121107 is a prime.

It is a super-2 number, since 2×251221252121139² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251221252121097 and 251221252121106.

It is not an unprimeable number, because it can be changed into a prime (251221250121139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13888058407 + ... + 13888076495.

It is an arithmetic number, because the mean of its divisors is an integer number (10532064933000).

Almost surely, 2^{251221252121139} is an apocalyptic number.

251221252121139 is a deficient number, since it is larger than the sum of its proper divisors (85804825734861).

251221252121139 is a wasteful number, since it uses less digits than its factorization.

251221252121139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31667.

The product of its digits is 43200, while the sum is 39.

The spelling of 251221252121139 in words is "two hundred fifty-one trillion, two hundred twenty-one billion, two hundred fifty-two million, one hundred twenty-one thousand, one hundred thirty-nine".