21044704 has 24 divisors (see below), whose sum is σ = 43613640. Its totient is φ = 9968256.

The previous prime is 21044687. The next prime is 21044711. The reversal of 21044704 is 40744012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16699 + ... + 17914.

It is an arithmetic number, because the mean of its divisors is an integer number (1817235).

Almost surely, 2^21044704 is an apocalyptic number.

It is an amenable number.

21044704 is an abundant number, since it is smaller than the sum of its proper divisors (22568936).

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

21044704 is a wasteful number, since it uses less digits than its factorization.

21044704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34642 (or 34634 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 21044704 is about 4587.4507081821. The cubic root of 21044704 is about 276.0880486426.

Adding to 21044704 its reverse (40744012), we get a palindrome (61788716).

The spelling of 21044704 in words is "twenty-one million, forty-four thousand, seven hundred four".