21233336 has 32 divisors (see below), whose sum is σ = 43362000. Its totient is φ = 9709056.

The previous prime is 21233321. The next prime is 21233339. The reversal of 21233336 is 63333212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2000 + ... + 6816.

Almost surely, 2^21233336 is an apocalyptic number.

It is an amenable number.

21233336 is an abundant number, since it is smaller than the sum of its proper divisors (22128664).

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

21233336 is a wasteful number, since it uses less digits than its factorization.

21233336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4871 (or 4867 counting only the distinct ones).

The product of its digits is 1944, while the sum is 23.

The square root of 21233336 is about 4607.9644095848. The cubic root of 21233336 is about 276.9104916566.

Adding to 21233336 its reverse (63333212), we get a palindrome (84566548).

The spelling of 21233336 in words is "twenty-one million, two hundred thirty-three thousand, three hundred thirty-six".