320203021321 has 4 divisors (see below), whose sum is σ = 321448947732. Its totient is φ = 318957094912.

The previous prime is 320203021309. The next prime is 320203021387. The reversal of 320203021321 is 123120302023.

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 147562771321 + 172640250000 = 384139^2 + 415500^2 .

It is a cyclic number.

It is not a de Polignac number, because 320203021321 - 2²³ = 320194632713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320203021301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622962820 + ... + 622963333.

It is an arithmetic number, because the mean of its divisors is an integer number (80362236933).

Almost surely, 2^320203021321 is an apocalyptic number.

It is an amenable number.

320203021321 is a deficient number, since it is larger than the sum of its proper divisors (1245926411).

320203021321 is a wasteful number, since it uses less digits than its factorization.

320203021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245926410.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 320203021321 its reverse (123120302023), we get a palindrome (443323323344).

The spelling of 320203021321 in words is "three hundred twenty billion, two hundred three million, twenty-one thousand, three hundred twenty-one".