2100210985 has 4 divisors (see below), whose sum is σ = 2520253188. Its totient is φ = 1680168784.

The previous prime is 2100210941. The next prime is 2100210997. The reversal of 2100210985 is 5890120012.

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 1072431504 + 1027779481 = 32748^2 + 32059^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100210985 - 2¹⁵ = 2100178217 is a prime.

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, 210021094 + ... + 210021103.

It is an arithmetic number, because the mean of its divisors is an integer number (630063297).

Almost surely, 2^2100210985 is an apocalyptic number.

It is an amenable number.

2100210985 is a deficient number, since it is larger than the sum of its proper divisors (420042203).

2100210985 is an equidigital number, since it uses as much as digits as its factorization.

2100210985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420042202.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 2100210985 is about 45828.0589268191. The cubic root of 2100210985 is about 1280.6220497410.

Adding to 2100210985 its reverse (5890120012), we get a palindrome (7990330997).

The spelling of 2100210985 in words is "two billion, one hundred million, two hundred ten thousand, nine hundred eighty-five".