12371221 has 2 divisors, whose sum is σ = 12371222. Its totient is φ = 12371220.

The previous prime is 12371213. The next prime is 12371231. The reversal of 12371221 is 12217321.

12371221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12327121 + 44100 = 3511^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 12371221 - 2³ = 12371213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12371231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6185610 + 6185611.

It is an arithmetic number, because the mean of its divisors is an integer number (6185611).

Almost surely, 2^12371221 is an apocalyptic number.

It is an amenable number.

12371221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12371221 is an equidigital number, since it uses as much as digits as its factorization.

12371221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 19.

The square root of 12371221 is about 3517.2746551840. The cubic root of 12371221 is about 231.2797034161.

Adding to 12371221 its reverse (12217321), we get a palindrome (24588542).

It can be divided in two parts, 123712 and 21, that multiplied together give a palindrome (2597952).

The spelling of 12371221 in words is "twelve million, three hundred seventy-one thousand, two hundred twenty-one".