328135221 has 12 divisors (see below), whose sum is σ = 475663500. Its totient is φ = 217976640.

The previous prime is 328135183. The next prime is 328135229. The reversal of 328135221 is 122531823.

It can be written as a sum of positive squares in 2 ways, for example, as 219454596 + 108680625 = 14814^2 + 10425^2 .

It is not a de Polignac number, because 328135221 - 2²⁵ = 294580789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328135229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62346 + ... + 67403.

It is an arithmetic number, because the mean of its divisors is an integer number (39638625).

Almost surely, 2^328135221 is an apocalyptic number.

It is an amenable number.

328135221 is a deficient number, since it is larger than the sum of its proper divisors (147528279).

328135221 is a wasteful number, since it uses less digits than its factorization.

328135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130036 (or 130033 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 328135221 is about 18114.5030569431. The cubic root of 328135221 is about 689.7382056626.

The spelling of 328135221 in words is "three hundred twenty-eight million, one hundred thirty-five thousand, two hundred twenty-one".