320424143221 has 24 divisors (see below), whose sum is σ = 425022859800. Its totient is φ = 238609308672.

The previous prime is 320424143189. The next prime is 320424143239. The reversal of 320424143221 is 122341424023.

It can be written as a sum of positive squares in 4 ways, for example, as 30453740100 + 289970403121 = 174510^2 + 538489^2 .

It is not a de Polignac number, because 320424143221 - 2⁵ = 320424143189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320424143221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320424143621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14783896 + ... + 14805553.

It is an arithmetic number, because the mean of its divisors is an integer number (17709285825).

Almost surely, 2^320424143221 is an apocalyptic number.

It is an amenable number.

320424143221 is a deficient number, since it is larger than the sum of its proper divisors (104598716579).

320424143221 is a wasteful number, since it uses less digits than its factorization.

320424143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29589493 (or 29589486 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 320424143221 its reverse (122341424023), we get a palindrome (442765567244).

The spelling of 320424143221 in words is "three hundred twenty billion, four hundred twenty-four million, one hundred forty-three thousand, two hundred twenty-one".