21338992 has 10 divisors (see below), whose sum is σ = 41344328. Its totient is φ = 10669488.

The previous prime is 21338953. The next prime is 21339001. The reversal of 21338992 is 29983312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 666828 + ... + 666859.

Almost surely, 2^21338992 is an apocalyptic number.

It is an amenable number.

21338992 is a deficient number, since it is larger than the sum of its proper divisors (20005336).

21338992 is a wasteful number, since it uses less digits than its factorization.

21338992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333695 (or 1333689 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 21338992 is about 4619.4146815370. The cubic root of 21338992 is about 277.3690294495.

The spelling of 21338992 in words is "twenty-one million, three hundred thirty-eight thousand, nine hundred ninety-two".