21104844 has 12 divisors (see below), whose sum is σ = 49244664. Its totient is φ = 7034944.

The previous prime is 21104843. The next prime is 21104849. The reversal of 21104844 is 44840112.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21104843) 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, 879357 + ... + 879380.

It is an arithmetic number, because the mean of its divisors is an integer number (4103722).

Almost surely, 2^21104844 is an apocalyptic number.

It is an amenable number.

21104844 is an abundant number, since it is smaller than the sum of its proper divisors (28139820).

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

21104844 is a wasteful number, since it uses less digits than its factorization.

21104844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758744 (or 1758742 counting only the distinct ones).

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

The square root of 21104844 is about 4594.0008707008. Note that the first 3 decimals coincide. The cubic root of 21104844 is about 276.3507931920.

Adding to 21104844 its reverse (44840112), we get a palindrome (65944956).

The spelling of 21104844 in words is "twenty-one million, one hundred four thousand, eight hundred forty-four".