21844049 has 4 divisors (see below), whose sum is σ = 22308864. Its totient is φ = 21379236.

The previous prime is 21844033. The next prime is 21844051. The reversal of 21844049 is 94044812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21844049 - 2⁴ = 21844033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21844019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232337 + ... + 232430.

It is an arithmetic number, because the mean of its divisors is an integer number (5577216).

Almost surely, 2^21844049 is an apocalyptic number.

It is an amenable number.

21844049 is a deficient number, since it is larger than the sum of its proper divisors (464815).

21844049 is an equidigital number, since it uses as much as digits as its factorization.

21844049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464814.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21844049 is about 4673.7617611513. The cubic root of 21844049 is about 279.5402702464.

The spelling of 21844049 in words is "twenty-one million, eight hundred forty-four thousand, forty-nine".