21330604 has 12 divisors (see below), whose sum is σ = 38532928. Its totient is φ = 10321200.

The previous prime is 21330593. The next prime is 21330607. The reversal of 21330604 is 40603312.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (21330607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85887 + ... + 86134.

Almost surely, 2^21330604 is an apocalyptic number.

It is an amenable number.

21330604 is a deficient number, since it is larger than the sum of its proper divisors (17202324).

21330604 is a wasteful number, since it uses less digits than its factorization.

21330604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172056 (or 172054 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21330604 is about 4618.5066850661. The cubic root of 21330604 is about 277.3326816481.

Adding to 21330604 its reverse (40603312), we get a palindrome (61933916).

It can be divided in two parts, 21 and 330604, that added together give a square (330625 = 575²).

The spelling of 21330604 in words is "twenty-one million, three hundred thirty thousand, six hundred four".