21360832 has 28 divisors (see below), whose sum is σ = 43113960. Its totient is φ = 10497536.

The previous prime is 21360827. The next prime is 21360841. The reversal of 21360832 is 23806312.

It is a junction number, because it is equal to n+sod(n) for n = 21360797 and 21360806.

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, 948 + ... + 6604.

Almost surely, 2^21360832 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 21360832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21556980).

21360832 is an abundant number, since it is smaller than the sum of its proper divisors (21753128).

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

21360832 is an equidigital number, since it uses as much as digits as its factorization.

21360832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728 (or 5718 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21360832 is about 4621.7780128431. The cubic root of 21360832 is about 277.4636242664.

The spelling of 21360832 in words is "twenty-one million, three hundred sixty thousand, eight hundred thirty-two".