21329368 has 16 divisors (see below), whose sum is σ = 40500000. Its totient is φ = 10529376.

The previous prime is 21329311. The next prime is 21329377. The reversal of 21329368 is 86392312.

It is a happy number.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 16243 + ... + 17506.

It is an arithmetic number, because the mean of its divisors is an integer number (2531250).

Almost surely, 2^21329368 is an apocalyptic number.

It is an amenable number.

21329368 is a deficient number, since it is larger than the sum of its proper divisors (19170632).

21329368 is a wasteful number, since it uses less digits than its factorization.

21329368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33834 (or 33830 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 21329368 is about 4618.3728736428. The cubic root of 21329368 is about 277.3273248719.

The spelling of 21329368 in words is "twenty-one million, three hundred twenty-nine thousand, three hundred sixty-eight".