21608885 has 8 divisors (see below), whose sum is σ = 26183040. Its totient is φ = 17118864.

The previous prime is 21608837. The next prime is 21608893. The reversal of 21608885 is 58880612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21608885 - 2²⁴ = 4831669 is a prime.

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, 20465 + ... + 21494.

It is an arithmetic number, because the mean of its divisors is an integer number (3272880).

Almost surely, 2^21608885 is an apocalyptic number.

It is an amenable number.

21608885 is a deficient number, since it is larger than the sum of its proper divisors (4574155).

21608885 is a wasteful number, since it uses less digits than its factorization.

21608885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42067.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 21608885 is about 4648.5357909776. The cubic root of 21608885 is about 278.5335104459.

The spelling of 21608885 in words is "twenty-one million, six hundred eight thousand, eight hundred eighty-five".