12308221 has 6 divisors (see below), whose sum is σ = 13075130. Its totient is φ = 11583936.

The previous prime is 12308207. The next prime is 12308227. The reversal of 12308221 is 12280321.

12308221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 2604996 + 9703225 = 1614^2 + 3115^2 .

It is not a de Polignac number, because 12308221 - 2²³ = 3919613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12308227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21006 + ... + 21583.

Almost surely, 2^12308221 is an apocalyptic number.

It is an amenable number.

12308221 is a deficient number, since it is larger than the sum of its proper divisors (766909).

12308221 is an equidigital number, since it uses as much as digits as its factorization.

12308221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42623 (or 42606 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 12308221 is about 3508.3074266660. The cubic root of 12308221 is about 230.8864405634.

Adding to 12308221 its reverse (12280321), we get a palindrome (24588542).

The spelling of 12308221 in words is "twelve million, three hundred eight thousand, two hundred twenty-one".