330231221 has 4 divisors (see below), whose sum is σ = 330268812. Its totient is φ = 330193632.

The previous prime is 330231197. The next prime is 330231227. The reversal of 330231221 is 122132033.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 122132033 = 31 ⋅3939743.

It can be written as a sum of positive squares in 2 ways, for example, as 84180625 + 246050596 = 9175^2 + 15686^2 .

It is a cyclic number.

It is not a de Polignac number, because 330231221 - 2⁶ = 330231157 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 330231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (330231227) 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 3 ways as a sum of consecutive naturals, for example, 2201 + ... + 25793.

It is an arithmetic number, because the mean of its divisors is an integer number (82567203).

Almost surely, 2^330231221 is an apocalyptic number.

It is an amenable number.

330231221 is a deficient number, since it is larger than the sum of its proper divisors (37591).

330231221 is a wasteful number, since it uses less digits than its factorization.

330231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37590.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 330231221 is about 18172.2651587522. The cubic root of 330231221 is about 691.2036827920.

Adding to 330231221 its reverse (122132033), we get a palindrome (452363254).

The spelling of 330231221 in words is "three hundred thirty million, two hundred thirty-one thousand, two hundred twenty-one".