21559116 has 24 divisors (see below), whose sum is σ = 50379840. Its totient is φ = 7175632.

The previous prime is 21559103. The next prime is 21559117. The reversal of 21559116 is 61195512.

It is not an unprimeable number, because it can be changed into a prime (21559117) 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, 14395 + ... + 15821.

It is an arithmetic number, because the mean of its divisors is an integer number (2099160).

Almost surely, 2^21559116 is an apocalyptic number.

It is an amenable number.

21559116 is an abundant number, since it is smaller than the sum of its proper divisors (28820724).

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

21559116 is a wasteful number, since it uses less digits than its factorization.

21559116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693 (or 2691 counting only the distinct ones).

The product of its digits is 2700, while the sum is 30.

The square root of 21559116 is about 4643.1795140830. The cubic root of 21559116 is about 278.3195091161.

The spelling of 21559116 in words is "twenty-one million, five hundred fifty-nine thousand, one hundred sixteen".