320221233221 has 4 divisors (see below), whose sum is σ = 328031507244. Its totient is φ = 312410959200.

The previous prime is 320221233131. The next prime is 320221233247. The reversal of 320221233221 is 122332122023.

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 34963764196 + 285257469025 = 186986^2 + 534095^2 .

It is a cyclic number.

It is not a de Polignac number, because 320221233221 - 2³⁴ = 303041364037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320221233251) 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, 3905136950 + ... + 3905137031.

It is an arithmetic number, because the mean of its divisors is an integer number (82007876811).

Almost surely, 2^320221233221 is an apocalyptic number.

It is an amenable number.

320221233221 is a deficient number, since it is larger than the sum of its proper divisors (7810274023).

320221233221 is an equidigital number, since it uses as much as digits as its factorization.

320221233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7810274022.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 320221233221 its reverse (122332122023), we get a palindrome (442553355244).

The spelling of 320221233221 in words is "three hundred twenty billion, two hundred twenty-one million, two hundred thirty-three thousand, two hundred twenty-one".