21153304 has 16 divisors (see below), whose sum is σ = 41995800. Its totient is φ = 9954432.

The previous prime is 21153299. The next prime is 21153323. The reversal of 21153304 is 40335112.

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, 77634 + ... + 77905.

Almost surely, 2^21153304 is an apocalyptic number.

It is an amenable number.

21153304 is a deficient number, since it is larger than the sum of its proper divisors (20842496).

21153304 is a wasteful number, since it uses less digits than its factorization.

21153304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155562 (or 155558 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21153304 is about 4599.2721163245. The cubic root of 21153304 is about 276.5621462900.

Adding to 21153304 its reverse (40335112), we get a palindrome (61488416).

The spelling of 21153304 in words is "twenty-one million, one hundred fifty-three thousand, three hundred four".