21944304 has 80 divisors (see below), whose sum is σ = 63884800. Its totient is φ = 7210944.

The previous prime is 21944303. The next prime is 21944333. The reversal of 21944304 is 40344912.

21944304 is a `hidden beast` number, since 219 + 443 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33807 + ... + 34449.

It is an arithmetic number, because the mean of its divisors is an integer number (798560).

Almost surely, 2^21944304 is an apocalyptic number.

21944304 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 21944304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31942400).

21944304 is an abundant number, since it is smaller than the sum of its proper divisors (41940496).

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

21944304 is a wasteful number, since it uses less digits than its factorization.

21944304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21944304 is about 4684.4747837938. The cubic root of 21944304 is about 279.9672750870.

The spelling of 21944304 in words is "twenty-one million, nine hundred forty-four thousand, three hundred four".