1328382021 has 4 divisors (see below), whose sum is σ = 1771176032. Its totient is φ = 885588012.

The previous prime is 1328381969. The next prime is 1328382037. The reversal of 1328382021 is 1202838231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1328382021 - 2¹⁷ = 1328250949 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 1328382021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328382061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221397001 + ... + 221397006.

It is an arithmetic number, because the mean of its divisors is an integer number (442794008).

Almost surely, 2^1328382021 is an apocalyptic number.

It is an amenable number.

1328382021 is a deficient number, since it is larger than the sum of its proper divisors (442794011).

1328382021 is an equidigital number, since it uses as much as digits as its factorization.

1328382021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442794010.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1328382021 is about 36446.9754712239. The cubic root of 1328382021 is about 1099.2783202933.

The spelling of 1328382021 in words is "one billion, three hundred twenty-eight million, three hundred eighty-two thousand, twenty-one".