21841944 has 48 divisors (see below), whose sum is σ = 57652920. Its totient is φ = 6894720.

The previous prime is 21841913. The next prime is 21842021. The reversal of 21841944 is 44914812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7404 + ... + 9924.

Almost surely, 2^21841944 is an apocalyptic number.

21841944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21841944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28826460).

21841944 is an abundant number, since it is smaller than the sum of its proper divisors (35810976).

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

21841944 is a wasteful number, since it uses less digits than its factorization.

21841944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568 (or 2545 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 21841944 is about 4673.5365623904. The cubic root of 21841944 is about 279.5312906662.

The spelling of 21841944 in words is "twenty-one million, eight hundred forty-one thousand, nine hundred forty-four".