123221520773720 has 32 divisors (see below), whose sum is σ = 277248740202720. Its totient is φ = 49288551694080.

The previous prime is 123221520773711. The next prime is 123221520773759. The reversal of 123221520773720 is 27377025122321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60860900 + ... + 62852940.

It is an arithmetic number, because the mean of its divisors is an integer number (8664023131335).

Almost surely, 2^{123221520773720} is an apocalyptic number.

123221520773720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123221520773720 is an abundant number, since it is smaller than the sum of its proper divisors (154027219429000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123221520773720 is a wasteful number, since it uses less digits than its factorization.

123221520773720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538475 (or 3538471 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 44.

The spelling of 123221520773720 in words is "one hundred twenty-three trillion, two hundred twenty-one billion, five hundred twenty million, seven hundred seventy-three thousand, seven hundred twenty".