2123112111 has 4 divisors (see below), whose sum is σ = 2830816152. Its totient is φ = 1415408072.

The previous prime is 2123112091. The next prime is 2123112151. The reversal of 2123112111 is 1112113212.

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

It is a cyclic number.

It is not a de Polignac number, because 2123112111 - 2⁷ = 2123111983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123112151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353852016 + ... + 353852021.

It is an arithmetic number, because the mean of its divisors is an integer number (707704038).

Almost surely, 2^2123112111 is an apocalyptic number.

2123112111 is a deficient number, since it is larger than the sum of its proper divisors (707704041).

2123112111 is an equidigital number, since it uses as much as digits as its factorization.

2123112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707704040.

The product of its digits is 24, while the sum is 15.

The square root of 2123112111 is about 46077.2407051464. The cubic root of 2123112111 is about 1285.2599535653.

Adding to 2123112111 its reverse (1112113212), we get a palindrome (3235225323).

The spelling of 2123112111 in words is "two billion, one hundred twenty-three million, one hundred twelve thousand, one hundred eleven".