21044841 has 4 divisors (see below), whose sum is σ = 28059792. Its totient is φ = 14029892.

The previous prime is 21044833. The next prime is 21044873. The reversal of 21044841 is 14844012.

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 21044841 - 2³ = 21044833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21044831) 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 3 ways as a sum of consecutive naturals, for example, 3507471 + ... + 3507476.

It is an arithmetic number, because the mean of its divisors is an integer number (7014948).

Almost surely, 2^21044841 is an apocalyptic number.

It is an amenable number.

21044841 is a deficient number, since it is larger than the sum of its proper divisors (7014951).

21044841 is an equidigital number, since it uses as much as digits as its factorization.

21044841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7014950.

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 21044841 is about 4587.4656401983. The cubic root of 21044841 is about 276.0886477479.

Adding to 21044841 its reverse (14844012), we get a palindrome (35888853).

The spelling of 21044841 in words is "twenty-one million, forty-four thousand, eight hundred forty-one".