21944730 has 32 divisors (see below), whose sum is σ = 53265600. Its totient is φ = 5785472.

The previous prime is 21944701. The next prime is 21944759. The reversal of 21944730 is 3744912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21944701) and next prime (21944759).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440 + ... + 6779.

It is an arithmetic number, because the mean of its divisors is an integer number (1664550).

Almost surely, 2^21944730 is an apocalyptic number.

21944730 is an abundant number, since it is smaller than the sum of its proper divisors (31320870).

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

21944730 is a wasteful number, since it uses less digits than its factorization.

21944730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8318.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21944730 is about 4684.5202529181. The cubic root of 21944730 is about 279.9690867232.

The spelling of 21944730 in words is "twenty-one million, nine hundred forty-four thousand, seven hundred thirty".