385328772221 has 2 divisors, whose sum is σ = 385328772222. Its totient is φ = 385328772220.

The previous prime is 385328772173. The next prime is 385328772271. The reversal of 385328772221 is 122277823583.

It is an a-pointer prime, because the next prime (385328772271) can be obtained adding 385328772221 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377009508121 + 8319264100 = 614011^2 + 91210^2 .

It is a cyclic number.

It is not a de Polignac number, because 385328772221 - 2³⁴ = 368148903037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 385328772221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385328772271) 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 as a sum of consecutive naturals, namely, 192664386110 + 192664386111.

It is an arithmetic number, because the mean of its divisors is an integer number (192664386111).

Almost surely, 2^385328772221 is an apocalyptic number.

It is an amenable number.

385328772221 is a deficient number, since it is larger than the sum of its proper divisors (1).

385328772221 is an equidigital number, since it uses as much as digits as its factorization.

385328772221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 50.

The spelling of 385328772221 in words is "three hundred eighty-five billion, three hundred twenty-eight million, seven hundred seventy-two thousand, two hundred twenty-one".