2100210111 has 6 divisors (see below), whose sum is σ = 3033636840. Its totient is φ = 1400140068.

The previous prime is 2100210061. The next prime is 2100210143. The reversal of 2100210111 is 1110120012.

It is a happy number.

It is not a de Polignac number, because 2100210111 - 2⁷ = 2100209983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 233356679 = 2100210111 / (2 + 1 + 0 + 0 + 2 + 1 + 0 + 1 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 2100210093 and 2100210102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100211111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116678331 + ... + 116678348.

It is an arithmetic number, because the mean of its divisors is an integer number (505606140).

Almost surely, 2^2100210111 is an apocalyptic number.

2100210111 is a deficient number, since it is larger than the sum of its proper divisors (933426729).

2100210111 is a wasteful number, since it uses less digits than its factorization.

2100210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233356685 (or 233356682 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2100210111 is about 45828.0493911753. The cubic root of 2100210111 is about 1280.6218720980.

Adding to 2100210111 its reverse (1110120012), we get a palindrome (3210330123).

Subtracting from 2100210111 its reverse (1110120012), we obtain a palindrome (990090099).

It can be divided in two parts, 21002 and 10111, that added together give a palindrome (31113).

The spelling of 2100210111 in words is "two billion, one hundred million, two hundred ten thousand, one hundred eleven".