2102102111 has 4 divisors (see below), whose sum is σ = 2118148824. Its totient is φ = 2086055400.

The previous prime is 2102102081. The next prime is 2102102113. The reversal of 2102102111 is 1112012012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102102111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102102092 and 2102102101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102102113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8023160 + ... + 8023421.

It is an arithmetic number, because the mean of its divisors is an integer number (529537206).

Almost surely, 2^2102102111 is an apocalyptic number.

2102102111 is a deficient number, since it is larger than the sum of its proper divisors (16046713).

2102102111 is a wasteful number, since it uses less digits than its factorization.

2102102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16046712.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2102102111 is about 45848.6871240606. The cubic root of 2102102111 is about 1281.0063113113.

Adding to 2102102111 its reverse (1112012012), we get a palindrome (3214114123).

Subtracting from 2102102111 its reverse (1112012012), we obtain a palindrome (990090099).

The spelling of 2102102111 in words is "two billion, one hundred two million, one hundred two thousand, one hundred eleven".