320212221 has 16 divisors (see below), whose sum is σ = 516645504. Its totient is φ = 172214784.

The previous prime is 320212219. The next prime is 320212223. The reversal of 320212221 is 122212023.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (320212219) and next prime (320212223).

It is not a de Polignac number, because 320212221 - 2¹ = 320212219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320212223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448120 + ... + 448833.

It is an arithmetic number, because the mean of its divisors is an integer number (32290344).

Almost surely, 2^320212221 is an apocalyptic number.

It is an amenable number.

320212221 is a deficient number, since it is larger than the sum of its proper divisors (196433283).

320212221 is a wasteful number, since it uses less digits than its factorization.

320212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896980.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 320212221 is about 17894.4745941310. The cubic root of 320212221 is about 684.1415505926.

Adding to 320212221 its reverse (122212023), we get a palindrome (442424244).

The spelling of 320212221 in words is "three hundred twenty million, two hundred twelve thousand, two hundred twenty-one".