320201221 has 2 divisors, whose sum is σ = 320201222. Its totient is φ = 320201220.

The previous prime is 320201117. The next prime is 320201237. The reversal of 320201221 is 122102023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320016321 + 184900 = 17889^2 + 430^2 .

It is an emirp because it is prime and its reverse (122102023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320201221 - 2⁹ = 320200709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320201251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160100610 + 160100611.

It is an arithmetic number, because the mean of its divisors is an integer number (160100611).

Almost surely, 2^320201221 is an apocalyptic number.

It is an amenable number.

320201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320201221 is an equidigital number, since it uses as much as digits as its factorization.

320201221 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 320201221 is about 17894.1672340458. The cubic root of 320201221 is about 684.1337165763.

Adding to 320201221 its reverse (122102023), we get a palindrome (442303244).

The spelling of 320201221 in words is "three hundred twenty million, two hundred one thousand, two hundred twenty-one".