21108336 has 40 divisors (see below), whose sum is σ = 54896784. Its totient is φ = 6988800.

The previous prime is 21108323. The next prime is 21108343. The reversal of 21108336 is 63380112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6136 + ... + 8936.

Almost surely, 2^21108336 is an apocalyptic number.

It is an amenable number.

21108336 is an abundant number, since it is smaller than the sum of its proper divisors (33788448).

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

21108336 is a wasteful number, since it uses less digits than its factorization.

21108336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969 (or 2963 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21108336 is about 4594.3809158580. The cubic root of 21108336 is about 276.3660339862.

Adding to 21108336 its reverse (63380112), we get a palindrome (84488448).

The spelling of 21108336 in words is "twenty-one million, one hundred eight thousand, three hundred thirty-six".