21944768 has 28 divisors (see below), whose sum is σ = 43982640. Its totient is φ = 10862592.

The previous prime is 21944759. The next prime is 21944777. The reversal of 21944768 is 86744912.

It is an interprime number because it is at equal distance from previous prime (21944759) and next prime (21944777).

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, 4928 + ... + 8256.

Almost surely, 2^21944768 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 21944768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21991320).

21944768 is an abundant number, since it is smaller than the sum of its proper divisors (22037872).

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

21944768 is a wasteful number, since it uses less digits than its factorization.

21944768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444 (or 3434 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 21944768 is about 4684.5243088280. The cubic root of 21944768 is about 279.9692483234.

The spelling of 21944768 in words is "twenty-one million, nine hundred forty-four thousand, seven hundred sixty-eight".