2100010985 has 4 divisors (see below), whose sum is σ = 2520013188. Its totient is φ = 1680008784.

The previous prime is 2100010973. The next prime is 2100010999. The reversal of 2100010985 is 5890100012.

It is a happy number.

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 1468192489 + 631818496 = 38317^2 + 25136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100010985 - 2⁶ = 2100010921 is a prime.

It is a super-2 number, since 2×2100010985² = 8820092274241340450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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, 210001094 + ... + 210001103.

It is an arithmetic number, because the mean of its divisors is an integer number (630003297).

Almost surely, 2^2100010985 is an apocalyptic number.

It is an amenable number.

2100010985 is a deficient number, since it is larger than the sum of its proper divisors (420002203).

2100010985 is an equidigital number, since it uses as much as digits as its factorization.

2100010985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420002202.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 2100010985 is about 45825.8768055779. The cubic root of 2100010985 is about 1280.5813978665.

Adding to 2100010985 its reverse (5890100012), we get a palindrome (7990110997).

The spelling of 2100010985 in words is "two billion, one hundred million, ten thousand, nine hundred eighty-five".