21327820752 has 120 divisors (see below), whose sum is σ = 64582464672. Its totient is φ = 6047059200.

The previous prime is 21327820681. The next prime is 21327820769. The reversal of 21327820752 is 25702872312.

It is a self number, because there is not a number n which added to its sum of digits gives 21327820752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 273502 + ... + 342722.

Almost surely, 2^21327820752 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21327820752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32291232336).

21327820752 is an abundant number, since it is smaller than the sum of its proper divisors (43254643920).

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

21327820752 is a wasteful number, since it uses less digits than its factorization.

21327820752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69377 (or 69364 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The spelling of 21327820752 in words is "twenty-one billion, three hundred twenty-seven million, eight hundred twenty thousand, seven hundred fifty-two".