12018321 has 16 divisors (see below), whose sum is σ = 20348800. Its totient is φ = 6867504.

The previous prime is 12018319. The next prime is 12018329. The reversal of 12018321 is 12381021.

12018321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12018321 - 2¹ = 12018319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12018294 and 12018303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12018329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31606 + ... + 31983.

It is an arithmetic number, because the mean of its divisors is an integer number (1271800).

Almost surely, 2^12018321 is an apocalyptic number.

It is an amenable number.

12018321 is a deficient number, since it is larger than the sum of its proper divisors (8330479).

12018321 is an equidigital number, since it uses as much as digits as its factorization.

12018321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63605 (or 63599 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12018321 is about 3466.7450151403. The cubic root of 12018321 is about 229.0593020969.

Adding to 12018321 its reverse (12381021), we get a palindrome (24399342).

The spelling of 12018321 in words is "twelve million, eighteen thousand, three hundred twenty-one".