21928343552 has 48 divisors (see below), whose sum is σ = 43880218200. Its totient is φ = 10955612160.

The previous prime is 21928343531. The next prime is 21928343573. The reversal of 21928343552 is 25534382912.

It is an interprime number because it is at equal distance from previous prime (21928343531) and next prime (21928343573).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3230402 + ... + 3237182.

Almost surely, 2^21928343552 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 21928343552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21940109100).

21928343552 is an abundant number, since it is smaller than the sum of its proper divisors (21951874648).

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

21928343552 is an equidigital number, since it uses as much as digits as its factorization.

21928343552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8382 (or 8362 counting only the distinct ones).

The product of its digits is 518400, while the sum is 44.

The spelling of 21928343552 in words is "twenty-one billion, nine hundred twenty-eight million, three hundred forty-three thousand, five hundred fifty-two".