21884244 has 12 divisors (see below), whose sum is σ = 51063264. Its totient is φ = 7294744.

The previous prime is 21884227. The next prime is 21884263. The reversal of 21884244 is 44248812.

It is a tau number, because it is divible by the number of its divisors (12).

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, 911832 + ... + 911855.

It is an arithmetic number, because the mean of its divisors is an integer number (4255272).

Almost surely, 2^21884244 is an apocalyptic number.

It is an amenable number.

21884244 is an abundant number, since it is smaller than the sum of its proper divisors (29179020).

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

21884244 is a wasteful number, since it uses less digits than its factorization.

21884244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823694 (or 1823692 counting only the distinct ones).

The product of its digits is 16384, while the sum is 33.

The square root of 21884244 is about 4678.0598542558. The cubic root of 21884244 is about 279.7116248699.

The spelling of 21884244 in words is "twenty-one million, eight hundred eighty-four thousand, two hundred forty-four".