21304675765 has 8 divisors (see below), whose sum is σ = 25708436640. Its totient is φ = 16948523472.

The previous prime is 21304675663. The next prime is 21304675787. The reversal of 21304675765 is 56757640312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21304675765 - 2³³ = 12714741173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11901159 + ... + 11902948.

It is an arithmetic number, because the mean of its divisors is an integer number (3213554580).

Almost surely, 2^21304675765 is an apocalyptic number.

It is an amenable number.

21304675765 is a deficient number, since it is larger than the sum of its proper divisors (4403760875).

21304675765 is a wasteful number, since it uses less digits than its factorization.

21304675765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23804291.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 21304675765 in words is "twenty-one billion, three hundred four million, six hundred seventy-five thousand, seven hundred sixty-five".