12020321 has 4 divisors (see below), whose sum is σ = 12028932. Its totient is φ = 12011712.

The previous prime is 12020311. The next prime is 12020341. The reversal of 12020321 is 12302021.

It is a happy number.

12020321 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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12302021 = 509 ⋅24169.

It can be written as a sum of positive squares in 2 ways, for example, as 193600 + 11826721 = 440^2 + 3439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12020321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12020311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1676 + ... + 5181.

It is an arithmetic number, because the mean of its divisors is an integer number (3007233).

Almost surely, 2^12020321 is an apocalyptic number.

It is an amenable number.

12020321 is a deficient number, since it is larger than the sum of its proper divisors (8611).

12020321 is an equidigital number, since it uses as much as digits as its factorization.

12020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8610.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 12020321 is about 3467.0334581599. The cubic root of 12020321 is about 229.0720075099.

Adding to 12020321 its reverse (12302021), we get a palindrome (24322342).

The spelling of 12020321 in words is "twelve million, twenty thousand, three hundred twenty-one".