12126111 has 4 divisors (see below), whose sum is σ = 16168152. Its totient is φ = 8084072.

The previous prime is 12126109. The next prime is 12126131. The reversal of 12126111 is 11162121.

It is a happy number.

12126111 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11162121 = 3 ⋅3720707.

It is a cyclic number.

It is not a de Polignac number, because 12126111 - 2¹ = 12126109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12126131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021016 + ... + 2021021.

It is an arithmetic number, because the mean of its divisors is an integer number (4042038).

Almost surely, 2^12126111 is an apocalyptic number.

12126111 is a deficient number, since it is larger than the sum of its proper divisors (4042041).

12126111 is an equidigital number, since it uses as much as digits as its factorization.

12126111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042040.

The product of its digits is 24, while the sum is 15.

The square root of 12126111 is about 3482.2565959446. The cubic root of 12126111 is about 229.7420611833.

Adding to 12126111 its reverse (11162121), we get a palindrome (23288232).

The spelling of 12126111 in words is "twelve million, one hundred twenty-six thousand, one hundred eleven".