21322304 has 14 divisors (see below), whose sum is σ = 42311574. Its totient is φ = 10661120.

The previous prime is 21322297. The next prime is 21322307. The reversal of 21322304 is 40322312.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 1537600 = 4448^2 + 1240^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166517 + ... + 166644.

Almost surely, 2^21322304 is an apocalyptic number.

It is an amenable number.

21322304 is a deficient number, since it is larger than the sum of its proper divisors (20989270).

21322304 is an equidigital number, since it uses as much as digits as its factorization.

21322304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333173 (or 333163 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21322304 is about 4617.6080388010. The cubic root of 21322304 is about 277.2967057972.

Adding to 21322304 its reverse (40322312), we get a palindrome (61644616).

The spelling of 21322304 in words is "twenty-one million, three hundred twenty-two thousand, three hundred four".