11111221211222 has 16 divisors (see below), whose sum is σ = 18187486541712. Its totient is φ = 5049030597120.

The previous prime is 11111221211191. The next prime is 11111221211231. The reversal of 11111221211222 is 22211212211111.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 11111221211194 and 11111221211203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76150403 + ... + 76296174.

It is an arithmetic number, because the mean of its divisors is an integer number (1136717908857).

Almost surely, 2^{11111221211222} is an apocalyptic number.

11111221211222 is a deficient number, since it is larger than the sum of its proper divisors (7076265330490).

11111221211222 is a wasteful number, since it uses less digits than its factorization.

11111221211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152449903.

The product of its digits is 64, while the sum is 20.

Adding to 11111221211222 its reverse (22211212211111), we get a palindrome (33322433422333).

The spelling of 11111221211222 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".