123013205233521 has 32 divisors (see below), whose sum is σ = 167727961390080. Its totient is φ = 80170637241600.

The previous prime is 123013205233493. The next prime is 123013205233531. The reversal of 123013205233521 is 125332502310321.

It is a de Polignac number, because none of the positive numbers 2^k-123013205233521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123013205233531) 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, 54169696 + ... + 56394878.

It is an arithmetic number, because the mean of its divisors is an integer number (5241498793440).

Almost surely, 2^{123013205233521} is an apocalyptic number.

It is an amenable number.

123013205233521 is a deficient number, since it is larger than the sum of its proper divisors (44714756156559).

123013205233521 is a wasteful number, since it uses less digits than its factorization.

123013205233521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227097.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 123013205233521 its reverse (125332502310321), we get a palindrome (248345707543842).

The spelling of 123013205233521 in words is "one hundred twenty-three trillion, thirteen billion, two hundred five million, two hundred thirty-three thousand, five hundred twenty-one".