328220323821 has 24 divisors (see below), whose sum is σ = 511069145496. Its totient is φ = 201782275200.

The previous prime is 328220323793. The next prime is 328220323843. The reversal of 328220323821 is 128323022823.

It is a happy number.

328220323821 is a `hidden beast` number, since 3 + 28 + 220 + 32 + 382 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4311366921 + 323908956900 = 65661^2 + 569130^2 .

It is not a de Polignac number, because 328220323821 - 2⁷ = 328220323693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328220393821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1266130 + ... + 1503171.

It is an arithmetic number, because the mean of its divisors is an integer number (21294547729).

Almost surely, 2^328220323821 is an apocalyptic number.

It is an amenable number.

328220323821 is a deficient number, since it is larger than the sum of its proper divisors (182848821675).

328220323821 is a wasteful number, since it uses less digits than its factorization.

328220323821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770333 (or 2770330 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 328220323821 in words is "three hundred twenty-eight billion, two hundred twenty million, three hundred twenty-three thousand, eight hundred twenty-one".