210985 has 4 divisors (see below), whose sum is σ = 253188. Its totient is φ = 168784.

The previous prime is 210967. The next prime is 211007. The reversal of 210985 is 589012.

210985 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44521 + 166464 = 211^2 + 408^2 .

It is a cyclic number.

It is not a de Polignac number, because 210985 - 2⁷ = 210857 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21094 + ... + 21103.

It is an arithmetic number, because the mean of its divisors is an integer number (63297).

2²¹⁰⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

210985 is a deficient number, since it is larger than the sum of its proper divisors (42203).

210985 is an equidigital number, since it uses as much as digits as its factorization.

210985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42202.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 210985 is about 459.3310353111. The cubic root of 210985 is about 59.5320073535.

Adding to 210985 its reverse (589012), we get a palindrome (799997).

The spelling of 210985 in words is "two hundred ten thousand, nine hundred eighty-five".