21792355884 has 96 divisors (see below), whose sum is σ = 60907392000. Its totient is φ = 6698438208.

The previous prime is 21792355861. The next prime is 21792355901. The reversal of 21792355884 is 48855329712.

21792355884 is a `hidden beast` number, since 2 + 1 + 7 + 9 + 2 + 3 + 558 + 84 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 21792355884.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1451287 + ... + 1466225.

It is an arithmetic number, because the mean of its divisors is an integer number (634452000).

Almost surely, 2^21792355884 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 21792355884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30453696000).

21792355884 is an abundant number, since it is smaller than the sum of its proper divisors (39115036116).

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

21792355884 is a wasteful number, since it uses less digits than its factorization.

21792355884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16004 (or 15996 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 21792355884 in words is "twenty-one billion, seven hundred ninety-two million, three hundred fifty-five thousand, eight hundred eighty-four".