21002088768 has 56 divisors (see below), whose sum is σ = 55614905280. Its totient is φ = 6994790400.

The previous prime is 21002088749. The next prime is 21002088781. The reversal of 21002088768 is 86788020012.

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, 185053 + ... + 276131.

Almost surely, 2^21002088768 is an apocalyptic number.

It is an amenable number.

21002088768 is an abundant number, since it is smaller than the sum of its proper divisors (34612816512).

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

21002088768 is a wasteful number, since it uses less digits than its factorization.

21002088768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92295 (or 92285 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 21002088768 in words is "twenty-one billion, two million, eighty-eight thousand, seven hundred sixty-eight".