320325221 has 4 divisors (see below), whose sum is σ = 320467212. Its totient is φ = 320183232.

The previous prime is 320325211. The next prime is 320325223. The reversal of 320325221 is 122523023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160934596 + 159390625 = 12686^2 + 12625^2 .

It is a cyclic number.

It is not a de Polignac number, because 320325221 - 2⁶ = 320325157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320325193 and 320325202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320325223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67556 + ... + 72141.

It is an arithmetic number, because the mean of its divisors is an integer number (80116803).

Almost surely, 2^320325221 is an apocalyptic number.

It is an amenable number.

320325221 is a deficient number, since it is larger than the sum of its proper divisors (141991).

320325221 is a wasteful number, since it uses less digits than its factorization.

320325221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141990.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 320325221 is about 17897.6317148387. The cubic root of 320325221 is about 684.2220169189. Note that the first 3 decimals are identical.

Adding to 320325221 its reverse (122523023), we get a palindrome (442848244).

The spelling of 320325221 in words is "three hundred twenty million, three hundred twenty-five thousand, two hundred twenty-one".