12222111111 has 64 divisors (see below), whose sum is σ = 19557888000. Its totient is φ = 6782227200.

The previous prime is 12222111107. The next prime is 12222111127. The reversal of 12222111111 is 11111122221.

It is a happy number.

It is not a de Polignac number, because 12222111111 - 2² = 12222111107 is a prime.

12222111111 is a modest number, since divided by 111111 gives 12222 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222111191) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11432685 + ... + 11433753.

It is an arithmetic number, because the mean of its divisors is an integer number (305592000).

Almost surely, 2^12222111111 is an apocalyptic number.

12222111111 is a deficient number, since it is larger than the sum of its proper divisors (7335776889).

12222111111 is a wasteful number, since it uses less digits than its factorization.

12222111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405 (or 1391 counting only the distinct ones).

The product of its digits is 16, while the sum is 15.

Adding to 12222111111 its reverse (11111122221), we get a palindrome (23333233332).

It can be divided in two parts, 122221 and 11111, that multiplied together give a palindrome (1357997531).

The spelling of 12222111111 in words is "twelve billion, two hundred twenty-two million, one hundred eleven thousand, one hundred eleven".