21944244 has 24 divisors (see below), whose sum is σ = 58518208. Its totient is φ = 6269760.

The previous prime is 21944243. The next prime is 21944269. The reversal of 21944244 is 44244912.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130537 + ... + 130704.

Almost surely, 2^21944244 is an apocalyptic number.

It is an amenable number.

21944244 is an abundant number, since it is smaller than the sum of its proper divisors (36573964).

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

21944244 is a wasteful number, since it uses less digits than its factorization.

21944244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261255 (or 261253 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 21944244 is about 4684.4683796563. The cubic root of 21944244 is about 279.9670199251.

The spelling of 21944244 in words is "twenty-one million, nine hundred forty-four thousand, two hundred forty-four".