21313031312 has 80 divisors (see below), whose sum is σ = 42913753344. Its totient is φ = 10247040000.

The previous prime is 21313031279. The next prime is 21313031323.

21313031312 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17954783 + ... + 17955969.

Almost surely, 2^21313031312 is an apocalyptic number.

It is an amenable number.

21313031312 is an abundant number, since it is smaller than the sum of its proper divisors (21600722032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21313031312 is a wasteful number, since it uses less digits than its factorization.

21313031312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608 (or 1602 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

It can be divided in two parts, 213130 and 31312, that added together give a palindrome (244442).

The spelling of 21313031312 in words is "twenty-one billion, three hundred thirteen million, thirty-one thousand, three hundred twelve".