31021313242 has 4 divisors (see below), whose sum is σ = 46531969866. Its totient is φ = 15510656620.

The previous prime is 31021313231. The next prime is 31021313263. The reversal of 31021313242 is 24231312013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29686945401 + 1334367841 = 172299^2 + 36529^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7755328309 + ... + 7755328312.

Almost surely, 2^31021313242 is an apocalyptic number.

31021313242 is a deficient number, since it is larger than the sum of its proper divisors (15510656624).

31021313242 is a wasteful number, since it uses less digits than its factorization.

31021313242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15510656623.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31021313242 its reverse (24231312013), we get a palindrome (55252625255).

The spelling of 31021313242 in words is "thirty-one billion, twenty-one million, three hundred thirteen thousand, two hundred forty-two".