2111222111 has 4 divisors (see below), whose sum is σ = 2111338824. Its totient is φ = 2111105400.

The previous prime is 2111222101. The next prime is 2111222131. The reversal of 2111222111 is 1112221112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2111222111 - 2²² = 2107027807 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 (2111222101) 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, 24785 + ... + 69546.

It is an arithmetic number, because the mean of its divisors is an integer number (527834706).

Almost surely, 2^2111222111 is an apocalyptic number.

2111222111 is a deficient number, since it is larger than the sum of its proper divisors (116713).

2111222111 is an equidigital number, since it uses as much as digits as its factorization.

2111222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116712.

The product of its digits is 16, while the sum is 14.

The square root of 2111222111 is about 45948.0370745041. The cubic root of 2111222111 is about 1282.8561933578.

Adding to 2111222111 its reverse (1112221112), we get a palindrome (3223443223).

Subtracting from 2111222111 its reverse (1112221112), we obtain a palindrome (999000999).

It can be divided in two parts, 2 and 111222111, that multiplied together give a palindrome (222444222).

The spelling of 2111222111 in words is "two billion, one hundred eleven million, two hundred twenty-two thousand, one hundred eleven".