2100012111 has 6 divisors (see below), whose sum is σ = 3033350840. Its totient is φ = 1400008068.

The previous prime is 2100012017. The next prime is 2100012121. The reversal of 2100012111 is 1112100012.

It is a happy number.

It is not a de Polignac number, because 2100012111 - 2¹⁰ = 2100011087 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: 233334679 = 2100012111 / (2 + 1 + 0 + 0 + 0 + 1 + 2 + 1 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100012093 and 2100012102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100012121) 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, 116667331 + ... + 116667348.

Almost surely, 2^2100012111 is an apocalyptic number.

2100012111 is a deficient number, since it is larger than the sum of its proper divisors (933338729).

2100012111 is a wasteful number, since it uses less digits than its factorization.

2100012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233334685 (or 233334682 counting only the distinct ones).

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

The square root of 2100012111 is about 45825.8890912113. The cubic root of 2100012111 is about 1280.5816267438.

Adding to 2100012111 its reverse (1112100012), we get a palindrome (3212112123).

It can be divided in two parts, 2100012 and 111, that multiplied together give a palindrome (233101332).

The spelling of 2100012111 in words is "two billion, one hundred million, twelve thousand, one hundred eleven".