1323320202221 has 2 divisors, whose sum is σ = 1323320202222. Its totient is φ = 1323320202220.

The previous prime is 1323320202187. The next prime is 1323320202233. The reversal of 1323320202221 is 1222020233231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 750666288100 + 572653914121 = 866410^2 + 756739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323320202221 - 2¹⁸ = 1323319940077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323320202251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661660101110 + 661660101111.

It is an arithmetic number, because the mean of its divisors is an integer number (661660101111).

Almost surely, 2^{1323320202221} is an apocalyptic number.

It is an amenable number.

1323320202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323320202221 is an equidigital number, since it uses as much as digits as its factorization.

1323320202221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 1323320202221 its reverse (1222020233231), we get a palindrome (2545340435452).

The spelling of 1323320202221 in words is "one trillion, three hundred twenty-three billion, three hundred twenty million, two hundred two thousand, two hundred twenty-one".