2111201111 has 4 divisors (see below), whose sum is σ = 2111293224. Its totient is φ = 2111109000.

The previous prime is 2111201101. The next prime is 2111201159. The reversal of 2111201111 is 1111021112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2111201111 - 2⁶ = 2111201047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111201092 and 2111201101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111201101) 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, 18296 + ... + 67506.

It is an arithmetic number, because the mean of its divisors is an integer number (527823306).

Almost surely, 2^2111201111 is an apocalyptic number.

2111201111 is a deficient number, since it is larger than the sum of its proper divisors (92113).

2111201111 is an equidigital number, since it uses as much as digits as its factorization.

2111201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92112.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 2111201111 is about 45947.8085549246. The cubic root of 2111201111 is about 1282.8519398862.

Adding to 2111201111 its reverse (1111021112), we get a palindrome (3222222223).

The spelling of 2111201111 in words is "two billion, one hundred eleven million, two hundred one thousand, one hundred eleven".