11111120111 has 32 divisors (see below), whose sum is σ = 13862876160. Its totient is φ = 8670945024.

The previous prime is 11111120081. The next prime is 11111120123. The reversal of 11111120111 is 11102111111.

It is a happy number.

It is not a de Polignac number, because 11111120111 - 2⁶ = 11111120047 is a prime.

It is a super-3 number, since 3×11111120111³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11111120092 and 11111120101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111120131) 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 31 ways as a sum of consecutive naturals, for example, 8526686 + ... + 8527988.

It is an arithmetic number, because the mean of its divisors is an integer number (433214880).

Almost surely, 2^11111120111 is an apocalyptic number.

11111120111 is a deficient number, since it is larger than the sum of its proper divisors (2751756049).

11111120111 is a wasteful number, since it uses less digits than its factorization.

11111120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11111120111 its reverse (11102111111), we get a palindrome (22213231222).

The spelling of 11111120111 in words is "eleven billion, one hundred eleven million, one hundred twenty thousand, one hundred eleven".