12320213221 has 2 divisors, whose sum is σ = 12320213222. Its totient is φ = 12320213220.

The previous prime is 12320213177. The next prime is 12320213251. The reversal of 12320213221 is 12231202321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12262240225 + 57972996 = 110735^2 + 7614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320213221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12320213251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160106610 + 6160106611.

It is an arithmetic number, because the mean of its divisors is an integer number (6160106611).

Almost surely, 2^12320213221 is an apocalyptic number.

It is an amenable number.

12320213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12320213221 is an equidigital number, since it uses as much as digits as its factorization.

12320213221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12320213221 its reverse (12231202321), we get a palindrome (24551415542).

The spelling of 12320213221 in words is "twelve billion, three hundred twenty million, two hundred thirteen thousand, two hundred twenty-one".