11111222222 has 4 divisors (see below), whose sum is σ = 16666833336. Its totient is φ = 5555611110.

The previous prime is 11111222207. The next prime is 11111222273. The reversal of 11111222222 is 22222211111.

It is a semiprime because it is the product of two primes.

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 self number, because there is not a number n which added to its sum of digits gives 11111222222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777805554 + ... + 2777805557.

It is an arithmetic number, because the mean of its divisors is an integer number (4166708334).

Almost surely, 2^11111222222 is an apocalyptic number.

11111222222 is a deficient number, since it is larger than the sum of its proper divisors (5555611114).

11111222222 is an equidigital number, since it uses as much as digits as its factorization.

11111222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555611113.

The product of its digits is 64, while the sum is 17.

Adding to 11111222222 its reverse (22222211111), we get a palindrome (33333433333).

The spelling of 11111222222 in words is "eleven billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-two".