11111111222 has 4 divisors (see below), whose sum is σ = 16666666836. Its totient is φ = 5555555610.

The previous prime is 11111111159. The next prime is 11111111237. The reversal of 11111111222 is 22211111111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22211111111 = 7 ⋅3173015873.

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 11111111197 and 11111111206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777777804 + ... + 2777777807.

It is an arithmetic number, because the mean of its divisors is an integer number (4166666709).

Almost surely, 2^11111111222 is an apocalyptic number.

11111111222 is a deficient number, since it is larger than the sum of its proper divisors (5555555614).

11111111222 is an equidigital number, since it uses as much as digits as its factorization.

11111111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555555613.

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

Adding to 11111111222 its reverse (22211111111), we get a palindrome (33322222333).

It can be divided in two parts, 11111111 and 222, that multiplied together give a palindrome (2466666642).

The spelling of 11111111222 in words is "eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-two".