11111122111 has 4 divisors (see below), whose sum is σ = 11112728472. Its totient is φ = 11109515752.

The previous prime is 11111122109. The next prime is 11111122117. The reversal of 11111122111 is 11122111111.

11111122111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11111122111 - 2¹ = 11111122109 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 = 11111122091 and 11111122100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111122117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792760 + ... + 806653.

It is an arithmetic number, because the mean of its divisors is an integer number (2778182118).

Almost surely, 2^11111122111 is an apocalyptic number.

11111122111 is a deficient number, since it is larger than the sum of its proper divisors (1606361).

11111122111 is an equidigital number, since it uses as much as digits as its factorization.

11111122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606360.

The product of its digits is 4, while the sum is 13.

Adding to 11111122111 its reverse (11122111111), we get a palindrome (22233233222).

It can be divided in two parts, 111 and 11122111, that multiplied together give a palindrome (1234554321).

The spelling of 11111122111 in words is "eleven billion, one hundred eleven million, one hundred twenty-two thousand, one hundred eleven".