320822221 has 2 divisors, whose sum is σ = 320822222. Its totient is φ = 320822220.

The previous prime is 320822219. The next prime is 320822261. The reversal of 320822221 is 122228023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169286121 + 151536100 = 13011^2 + 12310^2 .

It is an emirp because it is prime and its reverse (122228023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320822221 - 2¹ = 320822219 is a prime.

Together with 320822219, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 320822192 and 320822201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320822261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160411110 + 160411111.

It is an arithmetic number, because the mean of its divisors is an integer number (160411111).

Almost surely, 2^320822221 is an apocalyptic number.

It is an amenable number.

320822221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320822221 is an equidigital number, since it uses as much as digits as its factorization.

320822221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 320822221 is about 17911.5108519633. The cubic root of 320822221 is about 684.5757018609.

The spelling of 320822221 in words is "three hundred twenty million, eight hundred twenty-two thousand, two hundred twenty-one".