320543221 has 2 divisors, whose sum is σ = 320543222. Its totient is φ = 320543220.

The previous prime is 320543213. The next prime is 320543233. The reversal of 320543221 is 122345023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307300900 + 13242321 = 17530^2 + 3639^2 .

It is an emirp because it is prime and its reverse (122345023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320543221 - 2³ = 320543213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320543192 and 320543201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320543021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160271610 + 160271611.

It is an arithmetic number, because the mean of its divisors is an integer number (160271611).

Almost surely, 2^320543221 is an apocalyptic number.

It is an amenable number.

320543221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320543221 is an equidigital number, since it uses as much as digits as its factorization.

320543221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 320543221 is about 17903.7208702549. The cubic root of 320543221 is about 684.3771993869.

Adding to 320543221 its reverse (122345023), we get a palindrome (442888244).

The spelling of 320543221 in words is "three hundred twenty million, five hundred forty-three thousand, two hundred twenty-one".