123131021321013 has 32 divisors (see below), whose sum is σ = 180418064332800. Its totient is φ = 74349125712576.

The previous prime is 123131021320987. The next prime is 123131021321017. The reversal of 123131021321013 is 310123120131321.

It is not a de Polignac number, because 123131021321013 - 2⁸ = 123131021320757 is a prime.

It is a super-2 number, since 2×123131021321013² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131021321017) 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, 20484745 + ... + 25804782.

It is an arithmetic number, because the mean of its divisors is an integer number (5638064510400).

Almost surely, 2^{123131021321013} is an apocalyptic number.

It is an amenable number.

123131021321013 is a deficient number, since it is larger than the sum of its proper divisors (57287043011787).

123131021321013 is a wasteful number, since it uses less digits than its factorization.

123131021321013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46291601.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 123131021321013 its reverse (310123120131321), we get a palindrome (433254141452334).

The spelling of 123131021321013 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, twenty-one million, three hundred twenty-one thousand, thirteen".