12143221 has 2 divisors, whose sum is σ = 12143222. Its totient is φ = 12143220.

The previous prime is 12143189. The next prime is 12143233. The reversal of 12143221 is 12234121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9678321 + 2464900 = 3111^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 12143221 - 2⁵ = 12143189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12143195 and 12143204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12143251) 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 as a sum of consecutive naturals, namely, 6071610 + 6071611.

It is an arithmetic number, because the mean of its divisors is an integer number (6071611).

Almost surely, 2^12143221 is an apocalyptic number.

It is an amenable number.

12143221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12143221 is an equidigital number, since it uses as much as digits as its factorization.

12143221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 16.

The square root of 12143221 is about 3484.7124702047. The cubic root of 12143221 is about 229.8500661125.

Adding to 12143221 its reverse (12234121), we get a palindrome (24377342).

The spelling of 12143221 in words is "twelve million, one hundred forty-three thousand, two hundred twenty-one".