12443121 has 24 divisors (see below), whose sum is σ = 18776576. Its totient is φ = 7931520.

The previous prime is 12443107. The next prime is 12443129. The reversal of 12443121 is 12134421.

12443121 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 12443121 - 2⁵ = 12443089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12443094 and 12443103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12443129) 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 23 ways as a sum of consecutive naturals, for example, 28521 + ... + 28953.

Almost surely, 2^12443121 is an apocalyptic number.

It is an amenable number.

12443121 is a deficient number, since it is larger than the sum of its proper divisors (6333455).

12443121 is a wasteful number, since it uses less digits than its factorization.

12443121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 570 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 12443121 is about 3527.4808291471. The cubic root of 12443121 is about 231.7268944962.

Adding to 12443121 its reverse (12134421), we get a palindrome (24577542).

The spelling of 12443121 in words is "twelve million, four hundred forty-three thousand, one hundred twenty-one".