21013204304 has 20 divisors (see below), whose sum is σ = 41286509280. Its totient is φ = 10358621280.

The previous prime is 21013204241. The next prime is 21013204321. The reversal of 21013204304 is 40340231012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9247634 + ... + 9249905.

It is an arithmetic number, because the mean of its divisors is an integer number (2064325464).

Almost surely, 2^21013204304 is an apocalyptic number.

It is an amenable number.

21013204304 is a deficient number, since it is larger than the sum of its proper divisors (20273304976).

21013204304 is a wasteful number, since it uses less digits than its factorization.

21013204304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18497618 (or 18497612 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21013204304 its reverse (40340231012), we get a palindrome (61353435316).

The spelling of 21013204304 in words is "twenty-one billion, thirteen million, two hundred four thousand, three hundred four".