12120111 has 12 divisors (see below), whose sum is σ = 18155592. Its totient is φ = 8079912.

The previous prime is 12120091. The next prime is 12120179. The reversal of 12120111 is 11102121.

It is a happy number.

It is not a de Polignac number, because 12120111 - 2⁵ = 12120079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12120093 and 12120102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24696 + ... + 25181.

It is an arithmetic number, because the mean of its divisors is an integer number (1512966).

Almost surely, 2^12120111 is an apocalyptic number.

12120111 is a deficient number, since it is larger than the sum of its proper divisors (6035481).

12120111 is an frugal number, since it uses more digits than its factorization.

12120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49892 (or 49880 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 12120111 is about 3481.3949790278. The cubic root of 12120111 is about 229.7041628062.

Adding to 12120111 its reverse (11102121), we get a palindrome (23222232).

The spelling of 12120111 in words is "twelve million, one hundred twenty thousand, one hundred eleven".