31260831921 has 12 divisors (see below), whose sum is σ = 49259492880. Its totient is φ = 18945958680.

The previous prime is 31260831911. The next prime is 31260831983. The reversal of 31260831921 is 12913806213.

31260831921 is a `hidden beast` number, since 3 + 12 + 608 + 3 + 19 + 21 = 666.

It is not a de Polignac number, because 31260831921 - 2²⁵ = 31227277489 is a prime.

It is a super-2 number, since 2×31260831921² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31260831911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157882891 + ... + 157883088.

It is an arithmetic number, because the mean of its divisors is an integer number (4104957740).

Almost surely, 2^31260831921 is an apocalyptic number.

It is an amenable number.

31260831921 is a deficient number, since it is larger than the sum of its proper divisors (17998660959).

31260831921 is a wasteful number, since it uses less digits than its factorization.

31260831921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315765996 (or 315765993 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 31260831921 in words is "thirty-one billion, two hundred sixty million, eight hundred thirty-one thousand, nine hundred twenty-one".