21323332 has 18 divisors (see below), whose sum is σ = 37795898. Its totient is φ = 10526208.

The previous prime is 21323311. The next prime is 21323371. The reversal of 21323332 is 23332312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 15876 + 21307456 = 126^2 + 4616^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 31348 + ... + 32020.

Almost surely, 2^21323332 is an apocalyptic number.

It is an amenable number.

21323332 is a deficient number, since it is larger than the sum of its proper divisors (16472566).

21323332 is an equidigital number, since it uses as much as digits as its factorization.

21323332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855 (or 764 counting only the distinct ones).

The product of its digits is 648, while the sum is 19.

The square root of 21323332 is about 4617.7193505019. The cubic root of 21323332 is about 277.3011621079.

Adding to 21323332 its reverse (23332312), we get a palindrome (44655644).

The spelling of 21323332 in words is "twenty-one million, three hundred twenty-three thousand, three hundred thirty-two".