2143211111 has 2 divisors, whose sum is σ = 2143211112. Its totient is φ = 2143211110.

The previous prime is 2143211087. The next prime is 2143211113. The reversal of 2143211111 is 1111123412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2143211111 - 2³⁰ = 1069469287 is a prime.

Together with 2143211113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2143211111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143211113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071605555 + 1071605556.

It is an arithmetic number, because the mean of its divisors is an integer number (1071605556).

Almost surely, 2^2143211111 is an apocalyptic number.

2143211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143211111 is an equidigital number, since it uses as much as digits as its factorization.

2143211111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 17.

The square root of 2143211111 is about 46294.8281236684. The cubic root of 2143211111 is about 1289.3029728003.

Adding to 2143211111 its reverse (1111123412), we get a palindrome (3254334523).

The spelling of 2143211111 in words is "two billion, one hundred forty-three million, two hundred eleven thousand, one hundred eleven".