22112111111 has 4 divisors (see below), whose sum is σ = 22112641752. Its totient is φ = 22111580472.

The previous prime is 22112111107. The next prime is 22112111129. The reversal of 22112111111 is 11111121122.

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 22112111111 - 2² = 22112111107 is a prime.

It is a Duffinian number.

22112111111 is a modest number, since divided by 111111 gives 22112 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22112191111) 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, 196940 + ... + 288113.

It is an arithmetic number, because the mean of its divisors is an integer number (5528160438).

Almost surely, 2^22112111111 is an apocalyptic number.

22112111111 is a deficient number, since it is larger than the sum of its proper divisors (530641).

22112111111 is an equidigital number, since it uses as much as digits as its factorization.

22112111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530640.

The product of its digits is 8, while the sum is 14.

Adding to 22112111111 its reverse (11111121122), we get a palindrome (33223232233).

It can be divided in two parts, 221121111 and 11, that added together give a palindrome (221121122).

The spelling of 22112111111 in words is "twenty-two billion, one hundred twelve million, one hundred eleven thousand, one hundred eleven".