2111222111111 has 4 divisors (see below), whose sum is σ = 2111427034752. Its totient is φ = 2111017187472.

The previous prime is 2111222111057. The next prime is 2111222111113. The reversal of 2111222111111 is 1111112221112.

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 2111222111111 - 2¹⁰ = 2111222110087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111222111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111222111113) 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, 102446366 + ... + 102466971.

It is an arithmetic number, because the mean of its divisors is an integer number (527856758688).

Almost surely, 2^{2111222111111} is an apocalyptic number.

2111222111111 is a deficient number, since it is larger than the sum of its proper divisors (204923641).

2111222111111 is a wasteful number, since it uses less digits than its factorization.

2111222111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204923640.

The product of its digits is 16, while the sum is 17.

Adding to 2111222111111 its reverse (1111112221112), we get a palindrome (3222334332223).

The spelling of 2111222111111 in words is "two trillion, one hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand, one hundred eleven".