21765320304 has 80 divisors (see below), whose sum is σ = 69202570752. Its totient is φ = 5740303104.

The previous prime is 21765320299. The next prime is 21765320341. The reversal of 21765320304 is 40302356712.

It is a congruent number.

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, 2487084 + ... + 2495819.

Almost surely, 2^21765320304 is an apocalyptic number.

21765320304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21765320304 is an abundant number, since it is smaller than the sum of its proper divisors (47437250448).

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

21765320304 is a wasteful number, since it uses less digits than its factorization.

21765320304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982934 (or 4982928 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The spelling of 21765320304 in words is "twenty-one billion, seven hundred sixty-five million, three hundred twenty thousand, three hundred four".