328220393821 has 2 divisors, whose sum is σ = 328220393822. Its totient is φ = 328220393820.

The previous prime is 328220393797. The next prime is 328220393827. The reversal of 328220393821 is 128393022823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328112441721 + 107952100 = 572811^2 + 10390^2 .

It is a cyclic number.

It is not a de Polignac number, because 328220393821 - 2⁵ = 328220393789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328220393827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164110196910 + 164110196911.

It is an arithmetic number, because the mean of its divisors is an integer number (164110196911).

Almost surely, 2^328220393821 is an apocalyptic number.

It is an amenable number.

328220393821 is a deficient number, since it is larger than the sum of its proper divisors (1).

328220393821 is an equidigital number, since it uses as much as digits as its factorization.

328220393821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 328220393821 in words is "three hundred twenty-eight billion, two hundred twenty million, three hundred ninety-three thousand, eight hundred twenty-one".