320221135531 has 8 divisors (see below), whose sum is σ = 350321761584. Its totient is φ = 290285445120.

The previous prime is 320221135529. The next prime is 320221135537. The reversal of 320221135531 is 135531122023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 320221135531 - 2¹ = 320221135529 is a prime.

It is a super-2 number, since 2×320221135531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320221135531.

It is not an unprimeable number, because it can be changed into a prime (320221135537) 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 7 ways as a sum of consecutive naturals, for example, 41229846 + ... + 41237611.

It is an arithmetic number, because the mean of its divisors is an integer number (43790220198).

Almost surely, 2^320221135531 is an apocalyptic number.

320221135531 is a deficient number, since it is larger than the sum of its proper divisors (30100626053).

320221135531 is a wasteful number, since it uses less digits than its factorization.

320221135531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82467821.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 320221135531 its reverse (135531122023), we get a palindrome (455752257554).

The spelling of 320221135531 in words is "three hundred twenty billion, two hundred twenty-one million, one hundred thirty-five thousand, five hundred thirty-one".