320115221 has 8 divisors (see below), whose sum is σ = 322721280. Its totient is φ = 317518192.

The previous prime is 320115209. The next prime is 320115241. The reversal of 320115221 is 122511023.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320115221 is a prime.

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 320115221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320115241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80936 + ... + 84798.

It is an arithmetic number, because the mean of its divisors is an integer number (40340160).

Almost surely, 2^320115221 is an apocalyptic number.

It is an amenable number.

320115221 is a deficient number, since it is larger than the sum of its proper divisors (2606059).

320115221 is a wasteful number, since it uses less digits than its factorization.

320115221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4515.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 320115221 is about 17891.7640550059. The cubic root of 320115221 is about 684.0724626273.

Adding to 320115221 its reverse (122511023), we get a palindrome (442626244).

The spelling of 320115221 in words is "three hundred twenty million, one hundred fifteen thousand, two hundred twenty-one".