12320313221 has 2 divisors, whose sum is σ = 12320313222. Its totient is φ = 12320313220.

The previous prime is 12320313197. The next prime is 12320313227. The reversal of 12320313221 is 12231302321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6705808321 + 5614504900 = 81889^2 + 74930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320313221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12320313193 and 12320313202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12320313227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160156610 + 6160156611.

It is an arithmetic number, because the mean of its divisors is an integer number (6160156611).

Almost surely, 2^12320313221 is an apocalyptic number.

It is an amenable number.

12320313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12320313221 is an equidigital number, since it uses as much as digits as its factorization.

12320313221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12320313221 its reverse (12231302321), we get a palindrome (24551615542).

The spelling of 12320313221 in words is "twelve billion, three hundred twenty million, three hundred thirteen thousand, two hundred twenty-one".