320210221 has 2 divisors, whose sum is σ = 320210222. Its totient is φ = 320210220.

The previous prime is 320210197. The next prime is 320210227. The reversal of 320210221 is 122012023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166797225 + 153412996 = 12915^2 + 12386^2 .

It is a cyclic number.

It is not a de Polignac number, because 320210221 - 2¹¹ = 320208173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320210227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160105110 + 160105111.

It is an arithmetic number, because the mean of its divisors is an integer number (160105111).

Almost surely, 2^320210221 is an apocalyptic number.

It is an amenable number.

320210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320210221 is an equidigital number, since it uses as much as digits as its factorization.

320210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 320210221 is about 17894.4187108718. The cubic root of 320210221 is about 684.1401262393.

Adding to 320210221 its reverse (122012023), we get a palindrome (442222244).

The spelling of 320210221 in words is "three hundred twenty million, two hundred ten thousand, two hundred twenty-one".