21559089 has 8 divisors (see below), whose sum is σ = 28892160. Its totient is φ = 14299376.

The previous prime is 21559081. The next prime is 21559099. The reversal of 21559089 is 98095512.

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 21559089 - 2³ = 21559081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21559081) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 17649 + ... + 18830.

It is an arithmetic number, because the mean of its divisors is an integer number (3611520).

Almost surely, 2^21559089 is an apocalyptic number.

It is an amenable number.

21559089 is a deficient number, since it is larger than the sum of its proper divisors (7333071).

21559089 is a wasteful number, since it uses less digits than its factorization.

21559089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36679.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 21559089 is about 4643.1766065917. The cubic root of 21559089 is about 278.3193929297.

The spelling of 21559089 in words is "twenty-one million, five hundred fifty-nine thousand, eighty-nine".