123131210121031 has 4 divisors (see below), whose sum is σ = 140721382995472. Its totient is φ = 105541037246592.

The previous prime is 123131210121013. The next prime is 123131210121043. The reversal of 123131210121031 is 130121012131321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123131210121031 - 2³⁵ = 123096850382663 is a prime.

It is a super-2 number, since 2×123131210121031² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123131210120993 and 123131210121011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131210121061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8795086437210 + ... + 8795086437223.

It is an arithmetic number, because the mean of its divisors is an integer number (35180345748868).

Almost surely, 2^{123131210121031} is an apocalyptic number.

123131210121031 is a deficient number, since it is larger than the sum of its proper divisors (17590172874441).

123131210121031 is an equidigital number, since it uses as much as digits as its factorization.

123131210121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17590172874440.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 123131210121031 its reverse (130121012131321), we get a palindrome (253252222252352).

The spelling of 123131210121031 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, two hundred ten million, one hundred twenty-one thousand, thirty-one".