12123111 has 48 divisors (see below), whose sum is σ = 21926912. Its totient is φ = 5797440.

The previous prime is 12123107. The next prime is 12123151. The reversal of 12123111 is 11132121.

12123111 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12123111 - 2² = 12123107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32850 + ... + 33216.

Almost surely, 2^12123111 is an apocalyptic number.

12123111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12123111 is a deficient number, since it is larger than the sum of its proper divisors (9803801).

12123111 is a wasteful number, since it uses less digits than its factorization.

12123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 401 counting only the distinct ones).

The product of its digits is 12, while the sum is 12.

The square root of 12123111 is about 3481.8258141383. The cubic root of 12123111 is about 229.7231135578.

Adding to 12123111 its reverse (11132121), we get a palindrome (23255232).

It can be divided in two parts, 121 and 23111, that added together give a palindrome (23232).

The spelling of 12123111 in words is "twelve million, one hundred twenty-three thousand, one hundred eleven".