120111111 has 6 divisors (see below), whose sum is σ = 173493840. Its totient is φ = 80074068.

The previous prime is 120111073. The next prime is 120111163. The reversal of 120111111 is 111111021.

It is not a de Polignac number, because 120111111 - 2¹⁰ = 120110087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 13345679 = 120111111 / (1 + 2 + 0 + 1 + 1 + 1 + 1 + 1 + 1).

120111111 is a modest number, since divided by 11111 gives 1201 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 120111093 and 120111102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120111191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6672831 + ... + 6672848.

It is an arithmetic number, because the mean of its divisors is an integer number (28915640).

Almost surely, 2^120111111 is an apocalyptic number.

120111111 is a deficient number, since it is larger than the sum of its proper divisors (53382729).

120111111 is a wasteful number, since it uses less digits than its factorization.

120111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13345685 (or 13345682 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 120111111 is about 10959.5214767799. The cubic root of 120111111 is about 493.3946030651.

Adding to 120111111 its reverse (111111021), we get a palindrome (231222132).

The spelling of 120111111 in words is "one hundred twenty million, one hundred eleven thousand, one hundred eleven".