1328322221 has 2 divisors, whose sum is σ = 1328322222. Its totient is φ = 1328322220.

The previous prime is 1328322161. The next prime is 1328322227. The reversal of 1328322221 is 1222238231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1098193321 + 230128900 = 33139^2 + 15170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328322221 - 2⁶ = 1328322157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328322227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664161110 + 664161111.

It is an arithmetic number, because the mean of its divisors is an integer number (664161111).

Almost surely, 2^1328322221 is an apocalyptic number.

It is an amenable number.

1328322221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328322221 is an equidigital number, since it uses as much as digits as its factorization.

1328322221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 1328322221 is about 36446.1550921356. The cubic root of 1328322221 is about 1099.2618245792.

The spelling of 1328322221 in words is "one billion, three hundred twenty-eight million, three hundred twenty-two thousand, two hundred twenty-one".