1111111222211 has 4 divisors (see below), whose sum is σ = 1111235502624. Its totient is φ = 1110986941800.

The previous prime is 1111111222183. The next prime is 1111111222219. The reversal of 1111111222211 is 1122221111111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111111222211 is a prime.

It is a Duffinian number.

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 1111111222211.

It is not an unprimeable number, because it can be changed into a prime (1111111222219) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 62126795 + ... + 62144676.

It is an arithmetic number, because the mean of its divisors is an integer number (277808875656).

Almost surely, 2^{1111111222211} is an apocalyptic number.

1111111222211 is a deficient number, since it is larger than the sum of its proper divisors (124280413).

1111111222211 is an equidigital number, since it uses as much as digits as its factorization.

1111111222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124280412.

The product of its digits is 16, while the sum is 17.

Adding to 1111111222211 its reverse (1122221111111), we get a palindrome (2233332333322).

It can be divided in two parts, 11111 and 11222211, that multiplied together give a palindrome (124689986421).

The spelling of 1111111222211 in words is "one trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty-two thousand, two hundred eleven".