123131420324521 has 16 divisors (see below), whose sum is σ = 145261621411840. Its totient is φ = 102136246485840.

The previous prime is 123131420324327. The next prime is 123131420324557. The reversal of 123131420324521 is 125423024131321.

It is not a de Polignac number, because 123131420324521 - 2¹¹ = 123131420322473 is a prime.

It is a super-2 number, since 2×123131420324521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123131420324321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59675920 + ... + 61704766.

It is an arithmetic number, because the mean of its divisors is an integer number (9078851338240).

Almost surely, 2^{123131420324521} is an apocalyptic number.

It is an amenable number.

123131420324521 is a deficient number, since it is larger than the sum of its proper divisors (22130201087319).

123131420324521 is a wasteful number, since it uses less digits than its factorization.

123131420324521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308564.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 123131420324521 its reverse (125423024131321), we get a palindrome (248554444455842).

The spelling of 123131420324521 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, four hundred twenty million, three hundred twenty-four thousand, five hundred twenty-one".