21233312 has 12 divisors (see below), whose sum is σ = 41803146. Its totient is φ = 10616640.

The previous prime is 21233299. The next prime is 21233321. The reversal of 21233312 is 21333212.

It can be written as a sum of positive squares in only one way, i.e., 20394256 + 839056 = 4516^2 + 916^2 .

It is a zygodrome in base 4.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331739 + ... + 331802.

Almost surely, 2^21233312 is an apocalyptic number.

It is an amenable number.

21233312 is a deficient number, since it is larger than the sum of its proper divisors (20569834).

21233312 is an equidigital number, since it uses as much as digits as its factorization.

21233312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663551 (or 663543 counting only the distinct ones).

The product of its digits is 216, while the sum is 17.

The square root of 21233312 is about 4607.9618053973. The cubic root of 21233312 is about 276.9103873261.

Adding to 21233312 its reverse (21333212), we get a palindrome (42566524).

The spelling of 21233312 in words is "twenty-one million, two hundred thirty-three thousand, three hundred twelve".