123031321111155 has 32 divisors (see below), whose sum is σ = 197417320672320. Its totient is φ = 65427871541760.

The previous prime is 123031321111141. The next prime is 123031321111163. The reversal of 123031321111155 is 551111123130321.

It is not a de Polignac number, because 123031321111155 - 2¹² = 123031321107059 is a prime.

It is a super-2 number, since 2×123031321111155² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 973545 + ... + 15716565.

It is an arithmetic number, because the mean of its divisors is an integer number (6169291271010).

Almost surely, 2^{123031321111155} is an apocalyptic number.

123031321111155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123031321111155 is a deficient number, since it is larger than the sum of its proper divisors (74385999561165).

123031321111155 is a wasteful number, since it uses less digits than its factorization.

123031321111155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14744631.

The product of its (nonzero) digits is 2700, while the sum is 30.

Adding to 123031321111155 its reverse (551111123130321), we get a palindrome (674142444241476).

The spelling of 123031321111155 in words is "one hundred twenty-three trillion, thirty-one billion, three hundred twenty-one million, one hundred eleven thousand, one hundred fifty-five".