1328411821 has 4 divisors (see below), whose sum is σ = 1449176544. Its totient is φ = 1207647100.

The previous prime is 1328411803. The next prime is 1328411827. The reversal of 1328411821 is 1281148231.

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 1328411821 - 2⁵ = 1328411789 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328411827) 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 3 ways as a sum of consecutive naturals, for example, 60382345 + ... + 60382366.

It is an arithmetic number, because the mean of its divisors is an integer number (362294136).

Almost surely, 2^1328411821 is an apocalyptic number.

1328411821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1328411821 is a deficient number, since it is larger than the sum of its proper divisors (120764723).

1328411821 is a wasteful number, since it uses less digits than its factorization.

1328411821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120764722.

The product of its digits is 3072, while the sum is 31.

The square root of 1328411821 is about 36447.3842820030. The cubic root of 1328411821 is about 1099.2865403807.

The spelling of 1328411821 in words is "one billion, three hundred twenty-eight million, four hundred eleven thousand, eight hundred twenty-one".