31013312121 has 24 divisors (see below), whose sum is σ = 48989010720. Its totient is φ = 18749966400.

The previous prime is 31013312111. The next prime is 31013312159. The reversal of 31013312121 is 12121331013.

31013312121 is a `hidden beast` number, since 310 + 1 + 331 + 2 + 1 + 21 = 666.

It is not a de Polignac number, because 31013312121 - 2⁵ = 31013312089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31013312094 and 31013312103.

It is not an unprimeable number, because it can be changed into a prime (31013312111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342475 + ... + 423456.

It is an arithmetic number, because the mean of its divisors is an integer number (2041208780).

Almost surely, 2^31013312121 is an apocalyptic number.

It is an amenable number.

31013312121 is a deficient number, since it is larger than the sum of its proper divisors (17975698599).

31013312121 is a wasteful number, since it uses less digits than its factorization.

31013312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766357 (or 766354 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31013312121 its reverse (12121331013), we get a palindrome (43134643134).

The spelling of 31013312121 in words is "thirty-one billion, thirteen million, three hundred twelve thousand, one hundred twenty-one".