1328337821 has 2 divisors, whose sum is σ = 1328337822. Its totient is φ = 1328337820.

The previous prime is 1328337767. The next prime is 1328337827. The reversal of 1328337821 is 1287338231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267716025 + 60621796 = 35605^2 + 7786^2 .

It is an emirp because it is prime and its reverse (1287338231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1328337821 - 2¹⁴ = 1328321437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328337827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664168910 + 664168911.

It is an arithmetic number, because the mean of its divisors is an integer number (664168911).

Almost surely, 2^1328337821 is an apocalyptic number.

It is an amenable number.

1328337821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328337821 is an equidigital number, since it uses as much as digits as its factorization.

1328337821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 1328337821 is about 36446.3691058520. The cubic root of 1328337821 is about 1099.2661278567.

The spelling of 1328337821 in words is "one billion, three hundred twenty-eight million, three hundred thirty-seven thousand, eight hundred twenty-one".