21204344313 has 12 divisors (see below), whose sum is σ = 30701601840. Its totient is φ = 14102489016.

The previous prime is 21204344281. The next prime is 21204344339. The reversal of 21204344313 is 31344340212.

21204344313 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 4 + 344 + 313 = 666.

It is not a de Polignac number, because 21204344313 - 2⁵ = 21204344281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21204544313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2807731 + ... + 2815272.

It is an arithmetic number, because the mean of its divisors is an integer number (2558466820).

Almost surely, 2^21204344313 is an apocalyptic number.

It is an amenable number.

21204344313 is a deficient number, since it is larger than the sum of its proper divisors (9497257527).

21204344313 is a wasteful number, since it uses less digits than its factorization.

21204344313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623428 (or 5623425 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21204344313 its reverse (31344340212), we get a palindrome (52548684525).

The spelling of 21204344313 in words is "twenty-one billion, two hundred four million, three hundred forty-four thousand, three hundred thirteen".