123121043220123 has 96 divisors (see below), whose sum is σ = 198370860105600. Its totient is φ = 73063731621888.

The previous prime is 123121043220113. The next prime is 123121043220163. The reversal of 123121043220123 is 321022340121321.

123121043220123 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 2 + 1 + 0 + 432 + 201 + 23 = 666.

It is not a de Polignac number, because 123121043220123 - 2⁴ = 123121043220107 is a prime.

It is a super-2 number, since 2×123121043220123² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123121043220113) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10543887561 + ... + 10543899237.

It is an arithmetic number, because the mean of its divisors is an integer number (2066363126100).

Almost surely, 2^{123121043220123} is an apocalyptic number.

123121043220123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123121043220123 is a deficient number, since it is larger than the sum of its proper divisors (75249816885477).

123121043220123 is a wasteful number, since it uses less digits than its factorization.

123121043220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15301 (or 15298 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 123121043220123 its reverse (321022340121321), we get a palindrome (444143383341444).

The spelling of 123121043220123 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, forty-three million, two hundred twenty thousand, one hundred twenty-three".