21046304 has 24 divisors (see below), whose sum is σ = 41581008. Its totient is φ = 10486080.

The previous prime is 21046301. The next prime is 21046309. The reversal of 21046304 is 40364012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21046301) 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, 9599 + ... + 11585.

It is an arithmetic number, because the mean of its divisors is an integer number (1732542).

Almost surely, 2^21046304 is an apocalyptic number.

It is an amenable number.

21046304 is a deficient number, since it is larger than the sum of its proper divisors (20534704).

21046304 is a wasteful number, since it uses less digits than its factorization.

21046304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21046304 is about 4587.6250936623. The cubic root of 21046304 is about 276.0950453306.

The spelling of 21046304 in words is "twenty-one million, forty-six thousand, three hundred four".