21304633 has 8 divisors (see below), whose sum is σ = 24393600. Its totient is φ = 18227040.

The previous prime is 21304627. The next prime is 21304639. The reversal of 21304633 is 33640312.

It is an interprime number because it is at equal distance from previous prime (21304627) and next prime (21304639).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21304633 - 2⁹ = 21304121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21304639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1653 + ... + 6733.

It is an arithmetic number, because the mean of its divisors is an integer number (3049200).

Almost surely, 2^21304633 is an apocalyptic number.

It is an amenable number.

21304633 is a deficient number, since it is larger than the sum of its proper divisors (3088967).

21304633 is an equidigital number, since it uses as much as digits as its factorization.

21304633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5687.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 21304633 is about 4615.6942056423. The cubic root of 21304633 is about 277.2200808012.

Adding to 21304633 its reverse (33640312), we get a palindrome (54944945).

The spelling of 21304633 in words is "twenty-one million, three hundred four thousand, six hundred thirty-three".