23131405540521 has 32 divisors (see below), whose sum is σ = 34470389099520. Its totient is φ = 15330217352832.

The previous prime is 23131405540517. The next prime is 23131405540531. The reversal of 23131405540521 is 12504550413132.

23131405540521 is a `hidden beast` number, since 2 + 3 + 1 + 3 + 1 + 40 + 55 + 40 + 521 = 666.

It is not a de Polignac number, because 23131405540521 - 2² = 23131405540517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23131405540531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45931741 + ... + 46432613.

It is an arithmetic number, because the mean of its divisors is an integer number (1077199659360).

Almost surely, 2^{23131405540521} is an apocalyptic number.

It is an amenable number.

23131405540521 is a deficient number, since it is larger than the sum of its proper divisors (11338983558999).

23131405540521 is a wasteful number, since it uses less digits than its factorization.

23131405540521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510942 (or 510936 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 23131405540521 its reverse (12504550413132), we get a palindrome (35635955953653).

The spelling of 23131405540521 in words is "twenty-three trillion, one hundred thirty-one billion, four hundred five million, five hundred forty thousand, five hundred twenty-one".