320202221 has 2 divisors, whose sum is σ = 320202222. Its totient is φ = 320202220.

The previous prime is 320202187. The next prime is 320202257. The reversal of 320202221 is 122202023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232105225 + 88096996 = 15235^2 + 9386^2 .

It is an emirp because it is prime and its reverse (122202023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320202221 - 2¹⁸ = 319940077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320202196 and 320202205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320202271) 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, 160101110 + 160101111.

It is an arithmetic number, because the mean of its divisors is an integer number (160101111).

Almost surely, 2^320202221 is an apocalyptic number.

It is an amenable number.

320202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320202221 is an equidigital number, since it uses as much as digits as its factorization.

320202221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 320202221 is about 17894.1951760899. The cubic root of 320202221 is about 684.1344287670.

Adding to 320202221 its reverse (122202023), we get a palindrome (442404244).

The spelling of 320202221 in words is "three hundred twenty million, two hundred two thousand, two hundred twenty-one".