123311312023021 has 4 divisors (see below), whose sum is σ = 124508509227232. Its totient is φ = 122114114818812.

The previous prime is 123311312022959. The next prime is 123311312023087. The reversal of 123311312023021 is 120320213113321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123311312023021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123311312023721) 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, 598598601951 + ... + 598598602156.

It is an arithmetic number, because the mean of its divisors is an integer number (31127127306808).

Almost surely, 2^{123311312023021} is an apocalyptic number.

It is an amenable number.

123311312023021 is a deficient number, since it is larger than the sum of its proper divisors (1197197204211).

123311312023021 is a wasteful number, since it uses less digits than its factorization.

123311312023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197197204210.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 123311312023021 its reverse (120320213113321), we get a palindrome (243631525136342).

The spelling of 123311312023021 in words is "one hundred twenty-three trillion, three hundred eleven billion, three hundred twelve million, twenty-three thousand, twenty-one".