12443343221 has 2 divisors, whose sum is σ = 12443343222. Its totient is φ = 12443343220.

The previous prime is 12443343203. The next prime is 12443343223. The reversal of 12443343221 is 12234334421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10467540721 + 1975802500 = 102311^2 + 44450^2 .

It is an emirp because it is prime and its reverse (12234334421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12443343221 is a prime.

Together with 12443343223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12443343223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6221671610 + 6221671611.

It is an arithmetic number, because the mean of its divisors is an integer number (6221671611).

Almost surely, 2^12443343221 is an apocalyptic number.

It is an amenable number.

12443343221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12443343221 is an equidigital number, since it uses as much as digits as its factorization.

12443343221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 29.

Adding to 12443343221 its reverse (12234334421), we get a palindrome (24677677642).

The spelling of 12443343221 in words is "twelve billion, four hundred forty-three million, three hundred forty-three thousand, two hundred twenty-one".