320432221 has 2 divisors, whose sum is σ = 320432222. Its totient is φ = 320432220.

The previous prime is 320432219. The next prime is 320432227. The reversal of 320432221 is 122234023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 282609721 + 37822500 = 16811^2 + 6150^2 .

It is a cyclic number.

It is not a de Polignac number, because 320432221 - 2¹ = 320432219 is a prime.

Together with 320432219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320432227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160216110 + 160216111.

It is an arithmetic number, because the mean of its divisors is an integer number (160216111).

Almost surely, 2^320432221 is an apocalyptic number.

It is an amenable number.

320432221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320432221 is an equidigital number, since it uses as much as digits as its factorization.

320432221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 320432221 is about 17900.6206875628. The cubic root of 320432221 is about 684.2981932555.

Adding to 320432221 its reverse (122234023), we get a palindrome (442666244).

The spelling of 320432221 in words is "three hundred twenty million, four hundred thirty-two thousand, two hundred twenty-one".