21844412 has 12 divisors (see below), whose sum is σ = 38798760. Its totient is φ = 10759056.

The previous prime is 21844409. The next prime is 21844441. The reversal of 21844412 is 21444812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40487 + ... + 41022.

It is an arithmetic number, because the mean of its divisors is an integer number (3233230).

Almost surely, 2^21844412 is an apocalyptic number.

It is an amenable number.

21844412 is a deficient number, since it is larger than the sum of its proper divisors (16954348).

21844412 is a wasteful number, since it uses less digits than its factorization.

21844412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81580 (or 81578 counting only the distinct ones).

The product of its digits is 2048, while the sum is 26.

The square root of 21844412 is about 4673.8005948050. The cubic root of 21844412 is about 279.5418186857.

The spelling of 21844412 in words is "twenty-one million, eight hundred forty-four thousand, four hundred twelve".