1328918221 has 8 divisors (see below), whose sum is σ = 1349176320. Its totient is φ = 1308813408.

The previous prime is 1328918189. The next prime is 1328918231. The reversal of 1328918221 is 1228198231.

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 1328918221 - 2⁵ = 1328918189 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 (1328918231) 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 7 ways as a sum of consecutive naturals, for example, 20791 + ... + 55588.

It is an arithmetic number, because the mean of its divisors is an integer number (168647040).

Almost surely, 2^1328918221 is an apocalyptic number.

It is an amenable number.

1328918221 is a deficient number, since it is larger than the sum of its proper divisors (20258099).

1328918221 is a wasteful number, since it uses less digits than its factorization.

1328918221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76643.

The product of its digits is 13824, while the sum is 37.

The square root of 1328918221 is about 36454.3306206547. The cubic root of 1328918221 is about 1099.4262079079.

The spelling of 1328918221 in words is "one billion, three hundred twenty-eight million, nine hundred eighteen thousand, two hundred twenty-one".