2123312111 has 24 divisors (see below), whose sum is σ = 2337937920. Its totient is φ = 1925695296.

The previous prime is 2123312099. The next prime is 2123312167. The reversal of 2123312111 is 1112133212.

It is not a de Polignac number, because 2123312111 - 2¹⁰ = 2123311087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123312111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123312011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1328765 + ... + 1330361.

It is an arithmetic number, because the mean of its divisors is an integer number (97414080).

Almost surely, 2^2123312111 is an apocalyptic number.

2123312111 is a deficient number, since it is larger than the sum of its proper divisors (214625809).

2123312111 is a wasteful number, since it uses less digits than its factorization.

2123312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1772 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 2123312111 is about 46079.4109228840. The cubic root of 2123312111 is about 1285.3003100335.

Adding to 2123312111 its reverse (1112133212), we get a palindrome (3235445323).

The spelling of 2123312111 in words is "two billion, one hundred twenty-three million, three hundred twelve thousand, one hundred eleven".