11222111 has 4 divisors (see below), whose sum is σ = 11239800. Its totient is φ = 11204424.

The previous prime is 11222089. The next prime is 11222129. The reversal of 11222111 is 11122211.

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

It is a cyclic number.

It is not a de Polignac number, because 11222111 - 2¹⁰ = 11221087 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 11222092 and 11222101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7856 + ... + 9173.

It is an arithmetic number, because the mean of its divisors is an integer number (2809950).

Almost surely, 2^11222111 is an apocalyptic number.

11222111 is a deficient number, since it is larger than the sum of its proper divisors (17689).

11222111 is an equidigital number, since it uses as much as digits as its factorization.

11222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17688.

The product of its digits is 8, while the sum is 11.

The square root of 11222111 is about 3349.9419397954. The cubic root of 11222111 is about 223.8849257470.

Adding to 11222111 its reverse (11122211), we get a palindrome (22344322).

The spelling of 11222111 in words is "eleven million, two hundred twenty-two thousand, one hundred eleven".