21300304 has 10 divisors (see below), whose sum is σ = 41269370. Its totient is φ = 10650144.

The previous prime is 21300289. The next prime is 21300319. The reversal of 21300304 is 40300312.

It is an interprime number because it is at equal distance from previous prime (21300289) and next prime (21300319).

It can be written as a sum of positive squares in only one way, i.e., 14288400 + 7011904 = 3780^2 + 2648^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665619 + ... + 665650.

It is an arithmetic number, because the mean of its divisors is an integer number (4126937).

Almost surely, 2^21300304 is an apocalyptic number.

It is an amenable number.

21300304 is a deficient number, since it is larger than the sum of its proper divisors (19969066).

21300304 is a wasteful number, since it uses less digits than its factorization.

21300304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331277 (or 1331271 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21300304 is about 4615.2252382739. The cubic root of 21300304 is about 277.2013029291.

Adding to 21300304 its reverse (40300312), we get a palindrome (61600616).

The spelling of 21300304 in words is "twenty-one million, three hundred thousand, three hundred four".