123405540131121 has 8 divisors (see below), whose sum is σ = 165196260893664. Its totient is φ = 81942589728000.

The previous prime is 123405540131119. The next prime is 123405540131129. The reversal of 123405540131121 is 121131045504321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123405540131121 - 2¹ = 123405540131119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123405540131129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81942588976 + ... + 81942590481.

It is an arithmetic number, because the mean of its divisors is an integer number (20649532611708).

Almost surely, 2^{123405540131121} is an apocalyptic number.

It is an amenable number.

123405540131121 is a deficient number, since it is larger than the sum of its proper divisors (41790720762543).

123405540131121 is a wasteful number, since it uses less digits than its factorization.

123405540131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163885179711.

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 123405540131121 its reverse (121131045504321), we get a palindrome (244536585635442).

The spelling of 123405540131121 in words is "one hundred twenty-three trillion, four hundred five billion, five hundred forty million, one hundred thirty-one thousand, one hundred twenty-one".