21383608 has 16 divisors (see below), whose sum is σ = 40166280. Its totient is φ = 10672608.

The previous prime is 21383597. The next prime is 21383633. The reversal of 21383608 is 80638312.

It is a super-3 number, since 3×21383608³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21383608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3066 + ... + 7222.

Almost surely, 2^21383608 is an apocalyptic number.

It is an amenable number.

21383608 is a deficient number, since it is larger than the sum of its proper divisors (18782672).

21383608 is a wasteful number, since it uses less digits than its factorization.

21383608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806 (or 4802 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21383608 is about 4624.2413431827. The cubic root of 21383608 is about 277.5622044898.

The spelling of 21383608 in words is "twenty-one million, three hundred eighty-three thousand, six hundred eight".