11111221112222 has 32 divisors (see below), whose sum is σ = 20779629041664. Its totient is φ = 4329004989600.

The previous prime is 11111221112129. The next prime is 11111221112267. The reversal of 11111221112222 is 22221112211111.

It is a happy number.

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

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 11111221112194 and 11111221112203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18914972 + ... + 19493552.

It is an arithmetic number, because the mean of its divisors is an integer number (649363407552).

Almost surely, 2^{11111221112222} is an apocalyptic number.

11111221112222 is a deficient number, since it is larger than the sum of its proper divisors (9668407929442).

11111221112222 is a wasteful number, since it uses less digits than its factorization.

11111221112222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703304.

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

Adding to 11111221112222 its reverse (22221112211111), we get a palindrome (33332333323333).

The spelling of 11111221112222 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-two".