21944382 has 16 divisors (see below), whose sum is σ = 46470672. Its totient is φ = 6884480.

The previous prime is 21944359. The next prime is 21944393. The reversal of 21944382 is 28344912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107469 + ... + 107672.

It is an arithmetic number, because the mean of its divisors is an integer number (2904417).

Almost surely, 2^21944382 is an apocalyptic number.

21944382 is an abundant number, since it is smaller than the sum of its proper divisors (24526290).

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

21944382 is a wasteful number, since it uses less digits than its factorization.

21944382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215163.

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

The square root of 21944382 is about 4684.4831091594. The cubic root of 21944382 is about 279.9676067968.

The spelling of 21944382 in words is "twenty-one million, nine hundred forty-four thousand, three hundred eighty-two".