12312031123 has 16 divisors (see below), whose sum is σ = 14995077120. Its totient is φ = 9879556896.

The previous prime is 12312031099. The next prime is 12312031133. The reversal of 12312031123 is 32113021321.

It is a de Polignac number, because none of the positive numbers 2^k-12312031123 is a prime.

It is a super-2 number, since 2×12312031123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12312031123.

It is not an unprimeable number, because it can be changed into a prime (12312031133) 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, 805968 + ... + 821101.

It is an arithmetic number, because the mean of its divisors is an integer number (937192320).

Almost surely, 2^12312031123 is an apocalyptic number.

12312031123 is a deficient number, since it is larger than the sum of its proper divisors (2683045997).

12312031123 is a wasteful number, since it uses less digits than its factorization.

12312031123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627146.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12312031123 its reverse (32113021321), we get a palindrome (44425052444).

The spelling of 12312031123 in words is "twelve billion, three hundred twelve million, thirty-one thousand, one hundred twenty-three".