21844799 has 8 divisors (see below), whose sum is σ = 22263120. Its totient is φ = 21430656.

The previous prime is 21844793. The next prime is 21844807. The reversal of 21844799 is 99744812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21844799 - 2²⁴ = 5067583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21844793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10727 + ... + 12599.

It is an arithmetic number, because the mean of its divisors is an integer number (2782890).

Almost surely, 2^21844799 is an apocalyptic number.

21844799 is a deficient number, since it is larger than the sum of its proper divisors (418321).

21844799 is a wasteful number, since it uses less digits than its factorization.

21844799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089.

The product of its digits is 145152, while the sum is 44.

The square root of 21844799 is about 4673.8419956177. The cubic root of 21844799 is about 279.5434694824.

The spelling of 21844799 in words is "twenty-one million, eight hundred forty-four thousand, seven hundred ninety-nine".