210868889 has 16 divisors (see below), whose sum is σ = 271969920. Its totient is φ = 158645760.

The previous prime is 210868871. The next prime is 210868907. The reversal of 210868889 is 988868012.

It is an interprime number because it is at equal distance from previous prime (210868871) and next prime (210868907).

It is not a de Polignac number, because 210868889 - 2⁸ = 210868633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210868849) 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 15 ways as a sum of consecutive naturals, for example, 44984 + ... + 49449.

It is an arithmetic number, because the mean of its divisors is an integer number (16998120).

Almost surely, 2^210868889 is an apocalyptic number.

210868889 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

210868889 is a deficient number, since it is larger than the sum of its proper divisors (61101031).

210868889 is a wasteful number, since it uses less digits than its factorization.

210868889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94480.

The product of its (nonzero) digits is 442368, while the sum is 50.

The square root of 210868889 is about 14521.3253183034. The cubic root of 210868889 is about 595.2108463492.

The spelling of 210868889 in words is "two hundred ten million, eight hundred sixty-eight thousand, eight hundred eighty-nine".