12222211111 has 16 divisors (see below), whose sum is σ = 14113526400. Its totient is φ = 10467468000.

The previous prime is 12222211097. The next prime is 12222211123. The reversal of 12222211111 is 11111222221.

It is not a de Polignac number, because 12222211111 - 2⁹ = 12222210599 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 (12222211171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125940 + ... + 200761.

It is an arithmetic number, because the mean of its divisors is an integer number (882095400).

Almost surely, 2^12222211111 is an apocalyptic number.

12222211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12222211111 is a deficient number, since it is larger than the sum of its proper divisors (1891315289).

12222211111 is a wasteful number, since it uses less digits than its factorization.

12222211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326910.

The product of its digits is 32, while the sum is 16.

Adding to 12222211111 its reverse (11111222221), we get a palindrome (23333433332).

It can be divided in two parts, 1222221 and 1111, that multiplied together give a palindrome (1357887531).

The spelling of 12222211111 in words is "twelve billion, two hundred twenty-two million, two hundred eleven thousand, one hundred eleven".