111111011011111 has 8 divisors (see below), whose sum is σ = 117647860436640. Its totient is φ = 104574262430208.

The previous prime is 111111011011079. The next prime is 111111011011123. The reversal of 111111011011111 is 111110110111111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111111011011111 - 2⁵ = 111111011011079 is a prime.

It is a super-2 number, since 2×111111011011111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111011011091 and 111111011011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111011011151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22936866 + ... + 27355471.

It is an arithmetic number, because the mean of its divisors is an integer number (14705982554580).

Almost surely, 2^{111111011011111} is an apocalyptic number.

111111011011111 is a deficient number, since it is larger than the sum of its proper divisors (6536849425529).

111111011011111 is a wasteful number, since it uses less digits than its factorization.

111111011011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50422313.

The product of its (nonzero) digits is 1, while the sum is 13.

Adding to 111111011011111 its reverse (111110110111111), we get a palindrome (222221121122222).

The spelling of 111111011011111 in words is "one hundred eleven trillion, one hundred eleven billion, eleven million, eleven thousand, one hundred eleven".