331243221 has 16 divisors (see below), whose sum is σ = 445699520. Its totient is φ = 218816640.

The previous prime is 331243193. The next prime is 331243271. The reversal of 331243221 is 122342133.

It is not a de Polignac number, because 331243221 - 2¹⁴ = 331226837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331243271) 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 15 ways as a sum of consecutive naturals, for example, 205065 + ... + 206673.

It is an arithmetic number, because the mean of its divisors is an integer number (27856220).

Almost surely, 2^331243221 is an apocalyptic number.

It is an amenable number.

331243221 is a deficient number, since it is larger than the sum of its proper divisors (114456299).

331243221 is a wasteful number, since it uses less digits than its factorization.

331243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196.

The product of its digits is 864, while the sum is 21.

The square root of 331243221 is about 18200.0884887959. The cubic root of 331243221 is about 691.9090318068.

Adding to 331243221 its reverse (122342133), we get a palindrome (453585354).

The spelling of 331243221 in words is "three hundred thirty-one million, two hundred forty-three thousand, two hundred twenty-one".