21112659 has 12 divisors (see below), whose sum is σ = 30720456. Its totient is φ = 13971552.

The previous prime is 21112639. The next prime is 21112673. The reversal of 21112659 is 95621112.

21112659 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 2 + 659 = 666.

It is not a de Polignac number, because 21112659 - 2¹¹ = 21110611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112639) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7329 + ... + 9794.

It is an arithmetic number, because the mean of its divisors is an integer number (2560038).

Almost surely, 2^21112659 is an apocalyptic number.

21112659 is a deficient number, since it is larger than the sum of its proper divisors (9607797).

21112659 is a wasteful number, since it uses less digits than its factorization.

21112659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17266 (or 17263 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 21112659 is about 4594.8513577699. The cubic root of 21112659 is about 276.3848993421.

The spelling of 21112659 in words is "twenty-one million, one hundred twelve thousand, six hundred fifty-nine".