21765908352 has 64 divisors (see below), whose sum is σ = 58465400400. Its totient is φ = 7173771264.

The previous prime is 21765908321. The next prime is 21765908357. The reversal of 21765908352 is 25380956712.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21765908357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284263 + ... + 352614.

Almost surely, 2^21765908352 is an apocalyptic number.

It is an amenable number.

21765908352 is an abundant number, since it is smaller than the sum of its proper divisors (36699492048).

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

21765908352 is an equidigital number, since it uses as much as digits as its factorization.

21765908352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636983 (or 636971 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 21765908352 in words is "twenty-one billion, seven hundred sixty-five million, nine hundred eight thousand, three hundred fifty-two".