12012111 has 8 divisors (see below), whose sum is σ = 17795760. Its totient is φ = 8008056.

The previous prime is 12012109. The next prime is 12012113. The reversal of 12012111 is 11121021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12012109) and next prime (12012113).

It is not a de Polignac number, because 12012111 - 2¹ = 12012109 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 = 12012093 and 12012102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012113) 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, 222420 + ... + 222473.

It is an arithmetic number, because the mean of its divisors is an integer number (2224470).

Almost surely, 2^12012111 is an apocalyptic number.

12012111 is a deficient number, since it is larger than the sum of its proper divisors (5783649).

12012111 is an equidigital number, since it uses as much as digits as its factorization.

12012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444902 (or 444896 counting only the distinct ones).

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

The square root of 12012111 is about 3465.8492465772. The cubic root of 12012111 is about 229.0198428043.

Adding to 12012111 its reverse (11121021), we get a palindrome (23133132).

The spelling of 12012111 in words is "twelve million, twelve thousand, one hundred eleven".