2111123111 has 4 divisors (see below), whose sum is σ = 2156040672. Its totient is φ = 2066205552.

The previous prime is 2111123101. The next prime is 2111123137. The reversal of 2111123111 is 1113211112.

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-2111123111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111123101) 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, 22458710 + ... + 22458803.

It is an arithmetic number, because the mean of its divisors is an integer number (539010168).

Almost surely, 2^2111123111 is an apocalyptic number.

2111123111 is a deficient number, since it is larger than the sum of its proper divisors (44917561).

2111123111 is an equidigital number, since it uses as much as digits as its factorization.

2111123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44917560.

The product of its digits is 12, while the sum is 14.

The square root of 2111123111 is about 45946.9597579644. The cubic root of 2111123111 is about 1282.8361410308.

Adding to 2111123111 its reverse (1113211112), we get a palindrome (3224334223).

The spelling of 2111123111 in words is "two billion, one hundred eleven million, one hundred twenty-three thousand, one hundred eleven".