31542635421 has 48 divisors (see below), whose sum is σ = 50288030208. Its totient is φ = 18892656000.

The previous prime is 31542635387. The next prime is 31542635447. The reversal of 31542635421 is 12453624513.

31542635421 is a `hidden beast` number, since 3 + 1 + 54 + 2 + 63 + 542 + 1 = 666.

It is not a de Polignac number, because 31542635421 - 2¹⁸ = 31542373277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31542635461) 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 47 ways as a sum of consecutive naturals, for example, 6066795 + ... + 6071991.

It is an arithmetic number, because the mean of its divisors is an integer number (1047667296).

Almost surely, 2^31542635421 is an apocalyptic number.

It is an amenable number.

31542635421 is a deficient number, since it is larger than the sum of its proper divisors (18745394787).

31542635421 is a wasteful number, since it uses less digits than its factorization.

31542635421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5922 (or 5919 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 31542635421 in words is "thirty-one billion, five hundred forty-two million, six hundred thirty-five thousand, four hundred twenty-one".