21944832 has 160 divisors (see below), whose sum is σ = 72412032. Its totient is φ = 5750784.

The previous prime is 21944827. The next prime is 21944833. The reversal of 21944832 is 23844912.

It is a junction number, because it is equal to n+sod(n) for n = 21944793 and 21944802.

It is not an unprimeable number, because it can be changed into a prime (21944833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139698 + ... + 139854.

Almost surely, 2^21944832 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 21944832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36206016).

21944832 is an abundant number, since it is smaller than the sum of its proper divisors (50467200).

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

21944832 is a wasteful number, since it uses less digits than its factorization.

21944832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 182 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 21944832 is about 4684.5311398261. The cubic root of 21944832 is about 279.9695204918.

The spelling of 21944832 in words is "twenty-one million, nine hundred forty-four thousand, eight hundred thirty-two".