21110289 has 8 divisors (see below), whose sum is σ = 29117760. Its totient is φ = 13588176.

The previous prime is 21110263. The next prime is 21110363. The reversal of 21110289 is 98201112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21110289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21110249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121237 + ... + 121410.

It is an arithmetic number, because the mean of its divisors is an integer number (3639720).

Almost surely, 2^21110289 is an apocalyptic number.

21110289 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21110289 is a deficient number, since it is larger than the sum of its proper divisors (8007471).

21110289 is a wasteful number, since it uses less digits than its factorization.

21110289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242679.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 21110289 is about 4594.5934531795. The cubic root of 21110289 is about 276.3745570995.

The spelling of 21110289 in words is "twenty-one million, one hundred ten thousand, two hundred eighty-nine".