21033304 has 24 divisors (see below), whose sum is σ = 41628060. Its totient is φ = 9961776.

The previous prime is 21033289. The next prime is 21033317. The reversal of 21033304 is 40333012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 754 + ... + 6529.

Almost surely, 2^21033304 is an apocalyptic number.

It is an amenable number.

21033304 is a deficient number, since it is larger than the sum of its proper divisors (20594756).

21033304 is a wasteful number, since it uses less digits than its factorization.

21033304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7327 (or 7304 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21033304 is about 4586.2080197043. The cubic root of 21033304 is about 276.0381869728.

Adding to 21033304 its reverse (40333012), we get a palindrome (61366316).

The spelling of 21033304 in words is "twenty-one million, thirty-three thousand, three hundred four".