21298804 has 12 divisors (see below), whose sum is σ = 37305828. Its totient is φ = 10640000.

The previous prime is 21298799. The next prime is 21298819. The reversal of 21298804 is 40889212.

It can be written as a sum of positive squares in 2 ways, for example, as 5712100 + 15586704 = 2390^2 + 3948^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21298804.

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, 6204 + ... + 9004.

It is an arithmetic number, because the mean of its divisors is an integer number (3108819).

Almost surely, 2^21298804 is an apocalyptic number.

It is an amenable number.

21298804 is a deficient number, since it is larger than the sum of its proper divisors (16007024).

21298804 is a wasteful number, since it uses less digits than its factorization.

21298804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4706 (or 4704 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 21298804 is about 4615.0627298012. The cubic root of 21298804 is about 277.1947957964.

The spelling of 21298804 in words is "twenty-one million, two hundred ninety-eight thousand, eight hundred four".