21559086 has 24 divisors (see below), whose sum is σ = 47975304. Its totient is φ = 6991920.

The previous prime is 21559081. The next prime is 21559099. The reversal of 21559086 is 68095512.

It is a happy number.

21559086 is a `hidden beast` number, since 21 + 559 + 0 + 86 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21559086.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15520 + ... + 16851.

It is an arithmetic number, because the mean of its divisors is an integer number (1998971).

Almost surely, 2^21559086 is an apocalyptic number.

21559086 is an abundant number, since it is smaller than the sum of its proper divisors (26416218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21559086 is a wasteful number, since it uses less digits than its factorization.

21559086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32416 (or 32413 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 21559086 is about 4643.1762835369. The cubic root of 21559086 is about 278.3193800201.

The spelling of 21559086 in words is "twenty-one million, five hundred fifty-nine thousand, eighty-six".