320220221 has 8 divisors (see below), whose sum is σ = 322812600. Its totient is φ = 317634048.

The previous prime is 320220203. The next prime is 320220239. The reversal of 320220221 is 122022023.

It is an interprime number because it is at equal distance from previous prime (320220203) and next prime (320220239).

It can be written as a sum of positive squares in 4 ways, for example, as 59752900 + 260467321 = 7730^2 + 16139^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 320220221 - 2⁶ = 320220157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320220196 and 320220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320228221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192425 + ... + 194081.

It is an arithmetic number, because the mean of its divisors is an integer number (40351575).

Almost surely, 2^320220221 is an apocalyptic number.

It is an amenable number.

320220221 is a deficient number, since it is larger than the sum of its proper divisors (2592379).

320220221 is a wasteful number, since it uses less digits than its factorization.

320220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 320220221 is about 17894.6981254225. The cubic root of 320220221 is about 684.1472479463.

Adding to 320220221 its reverse (122022023), we get a palindrome (442242244).

It can be divided in two parts, 32022022 and 1, that added together give a palindrome (32022023).

The spelling of 320220221 in words is "three hundred twenty million, two hundred twenty thousand, two hundred twenty-one".