1328021311 has 4 divisors (see below), whose sum is σ = 1385761392. Its totient is φ = 1270281232.

The previous prime is 1328021309. The next prime is 1328021323. The reversal of 1328021311 is 1131208231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1131208231 = 2339 ⋅483629.

It is a cyclic number.

It is not a de Polignac number, because 1328021311 - 2¹ = 1328021309 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 (1328021341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28870006 + ... + 28870051.

It is an arithmetic number, because the mean of its divisors is an integer number (346440348).

Almost surely, 2^1328021311 is an apocalyptic number.

1328021311 is a deficient number, since it is larger than the sum of its proper divisors (57740081).

1328021311 is an equidigital number, since it uses as much as digits as its factorization.

1328021311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57740080.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1328021311 is about 36442.0267136722. The cubic root of 1328021311 is about 1099.1788116247.

Adding to 1328021311 its reverse (1131208231), we get a palindrome (2459229542).

The spelling of 1328021311 in words is "one billion, three hundred twenty-eight million, twenty-one thousand, three hundred eleven".