320131220321 has 16 divisors (see below), whose sum is σ = 349785838080. Its totient is φ = 290568952320.

The previous prime is 320131220293. The next prime is 320131220341. The reversal of 320131220321 is 123022131023.

It is a cyclic number.

It is not a de Polignac number, because 320131220321 - 2²⁶ = 320064111457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320131220293 and 320131220302.

It is not an unprimeable number, because it can be changed into a prime (320131220341) 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 15 ways as a sum of consecutive naturals, for example, 19192241 + ... + 19208913.

It is an arithmetic number, because the mean of its divisors is an integer number (21861614880).

Almost surely, 2^320131220321 is an apocalyptic number.

It is an amenable number.

320131220321 is a deficient number, since it is larger than the sum of its proper divisors (29654617759).

320131220321 is a wasteful number, since it uses less digits than its factorization.

320131220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19336.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 320131220321 its reverse (123022131023), we get a palindrome (443153351344).

The spelling of 320131220321 in words is "three hundred twenty billion, one hundred thirty-one million, two hundred twenty thousand, three hundred twenty-one".