21303304 has 16 divisors (see below), whose sum is σ = 43575120. Its totient is φ = 9683280.

The previous prime is 21303301. The next prime is 21303311. The reversal of 21303304 is 40330312.

It is a super-2 number, since 2×21303304² = 907661522632832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21303301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120954 + ... + 121129.

It is an arithmetic number, because the mean of its divisors is an integer number (2723445).

Almost surely, 2^21303304 is an apocalyptic number.

It is an amenable number.

21303304 is an abundant number, since it is smaller than the sum of its proper divisors (22271816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21303304 is a wasteful number, since it uses less digits than its factorization.

21303304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242100 (or 242096 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21303304 is about 4615.5502380540. The cubic root of 21303304 is about 277.2143162781.

Adding to 21303304 its reverse (40330312), we get a palindrome (61633616).

The spelling of 21303304 in words is "twenty-one million, three hundred three thousand, three hundred four".