12326221 has 6 divisors (see below), whose sum is σ = 12542222. Its totient is φ = 12113880.

The previous prime is 12326219. The next prime is 12326257. The reversal of 12326221 is 12262321.

12326221 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10150596 + 2175625 = 3186^2 + 1475^2 .

It is not a de Polignac number, because 12326221 - 2¹ = 12326219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12326201) 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, 1711 + ... + 5251.

Almost surely, 2^12326221 is an apocalyptic number.

It is an amenable number.

12326221 is a deficient number, since it is larger than the sum of its proper divisors (216001).

12326221 is an frugal number, since it uses more digits than its factorization.

12326221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659 (or 3600 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 12326221 is about 3510.8718290476. The cubic root of 12326221 is about 230.9989380460.

Adding to 12326221 its reverse (12262321), we get a palindrome (24588542).

The spelling of 12326221 in words is "twelve million, three hundred twenty-six thousand, two hundred twenty-one".