21116089 has 8 divisors (see below), whose sum is σ = 21960000. Its totient is φ = 20279952.

The previous prime is 21116063. The next prime is 21116099. The reversal of 21116089 is 98061112.

It is a happy number.

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 21116089 - 2⁷ = 21115961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21116059) 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 7 ways as a sum of consecutive naturals, for example, 3942 + ... + 7600.

It is an arithmetic number, because the mean of its divisors is an integer number (2745000).

Almost surely, 2^21116089 is an apocalyptic number.

21116089 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21116089 is a deficient number, since it is larger than the sum of its proper divisors (843911).

21116089 is a wasteful number, since it uses less digits than its factorization.

21116089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 21116089 is about 4595.2245864593. The cubic root of 21116089 is about 276.3998658585.

The spelling of 21116089 in words is "twenty-one million, one hundred sixteen thousand, eighty-nine".