111111122120111 has 8 divisors (see below), whose sum is σ = 111277415809344. Its totient is φ = 110944831979520.

The previous prime is 111111122120077. The next prime is 111111122120129. The reversal of 111111122120111 is 111021221111111.

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 111111122120111 - 2³⁴ = 111093942250927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111111122120111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111141122120111) 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, 65494010 + ... + 67169096.

It is an arithmetic number, because the mean of its divisors is an integer number (13909676976168).

Almost surely, 2^{111111122120111} is an apocalyptic number.

111111122120111 is a deficient number, since it is larger than the sum of its proper divisors (166293689233).

111111122120111 is an equidigital number, since it uses as much as digits as its factorization.

111111122120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774321.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 111111122120111 its reverse (111021221111111), we get a palindrome (222132343231222).

The spelling of 111111122120111 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty-two million, one hundred twenty thousand, one hundred eleven".