11122211111 has 16 divisors (see below), whose sum is σ = 12298998528. Its totient is φ = 9973891200.

The previous prime is 11122211101. The next prime is 11122211123. The reversal of 11122211111 is 11111222111.

It is a cyclic number.

It is not a de Polignac number, because 11122211111 - 2⁶ = 11122211047 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122211101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241070 + ... + 283476.

It is an arithmetic number, because the mean of its divisors is an integer number (768687408).

Almost surely, 2^11122211111 is an apocalyptic number.

11122211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11122211111 is a deficient number, since it is larger than the sum of its proper divisors (1176787417).

11122211111 is a wasteful number, since it uses less digits than its factorization.

11122211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42742.

The product of its digits is 8, while the sum is 14.

Adding to 11122211111 its reverse (11111222111), we get a palindrome (22233433222).

It can be divided in two parts, 111222111 and 11, that multiplied together give a palindrome (1223443221).

The spelling of 11122211111 in words is "eleven billion, one hundred twenty-two million, two hundred eleven thousand, one hundred eleven".