123121231312321 has 32 divisors (see below), whose sum is σ = 142372263461760. Its totient is φ = 105227841408000.

The previous prime is 123121231312319. The next prime is 123121231312351. The reversal of 123121231312321 is 123213132121321.

It is not a de Polignac number, because 123121231312321 - 2¹ = 123121231312319 is a prime.

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 123121231312321.

It is not an unprimeable number, because it can be changed into a prime (123121231312351) 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, 1057802490 + ... + 1057918876.

It is an arithmetic number, because the mean of its divisors is an integer number (4449133233180).

Almost surely, 2^{123121231312321} is an apocalyptic number.

123121231312321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123121231312321 is a deficient number, since it is larger than the sum of its proper divisors (19251032149439).

123121231312321 is a wasteful number, since it uses less digits than its factorization.

123121231312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122625.

The product of its digits is 2592, while the sum is 28.

Adding to 123121231312321 its reverse (123213132121321), we get a palindrome (246334363433642).

The spelling of 123121231312321 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, two hundred thirty-one million, three hundred twelve thousand, three hundred twenty-one".