21844801 has 24 divisors (see below), whose sum is σ = 26000640. Its totient is φ = 18160800.

The previous prime is 21844793. The next prime is 21844807. The reversal of 21844801 is 10844812.

It is not a de Polignac number, because 21844801 - 2³ = 21844793 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21844801.

It is not an unprimeable number, because it can be changed into a prime (21844807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464760 + ... + 464806.

It is an arithmetic number, because the mean of its divisors is an integer number (1083360).

Almost surely, 2^21844801 is an apocalyptic number.

It is an amenable number.

21844801 is a deficient number, since it is larger than the sum of its proper divisors (4155839).

21844801 is a wasteful number, since it uses less digits than its factorization.

21844801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 21844801 is about 4673.8422095745. The cubic root of 21844801 is about 279.5434780136.

The spelling of 21844801 in words is "twenty-one million, eight hundred forty-four thousand, eight hundred one".