2100120111 has 12 divisors (see below), whose sum is σ = 3115493992. Its totient is φ = 1362239856.

The previous prime is 2100120107. The next prime is 2100120149. The reversal of 2100120111 is 1110210012.

It is a happy number.

It is not a de Polignac number, because 2100120111 - 2² = 2100120107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100120093 and 2100120102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100120151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3153001 + ... + 3153666.

Almost surely, 2^2100120111 is an apocalyptic number.

2100120111 is a deficient number, since it is larger than the sum of its proper divisors (1015373881).

2100120111 is a wasteful number, since it uses less digits than its factorization.

2100120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6306710 (or 6306707 counting only the distinct ones).

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

The square root of 2100120111 is about 45827.0674492706. The cubic root of 2100120111 is about 1280.6035790687.

Adding to 2100120111 its reverse (1110210012), we get a palindrome (3210330123).

The spelling of 2100120111 in words is "two billion, one hundred million, one hundred twenty thousand, one hundred eleven".