111100121111 has 8 divisors (see below), whose sum is σ = 131349897120. Its totient is φ = 91944927648.

The previous prime is 111100121101. The next prime is 111100121117. The reversal of 111100121111 is 111121001111.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-111100121111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111100121092 and 111100121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100121117) 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, 273645416 + ... + 273645821.

It is an arithmetic number, because the mean of its divisors is an integer number (16418737140).

Almost surely, 2^111100121111 is an apocalyptic number.

111100121111 is a deficient number, since it is larger than the sum of its proper divisors (20249776009).

111100121111 is an equidigital number, since it uses as much as digits as its factorization.

111100121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547291273.

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

Adding to 111100121111 its reverse (111121001111), we get a palindrome (222221122222).

The spelling of 111100121111 in words is "one hundred eleven billion, one hundred million, one hundred twenty-one thousand, one hundred eleven".