388384428041821 has 2 divisors, whose sum is σ = 388384428041822. Its totient is φ = 388384428041820.

The previous prime is 388384428041749. The next prime is 388384428041837. The reversal of 388384428041821 is 128140824483883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208735601859225 + 179648826182596 = 14447685^2 + 13403314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388384428041821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388384428047821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194192214020910 + 194192214020911.

It is an arithmetic number, because the mean of its divisors is an integer number (194192214020911).

Almost surely, 2^{388384428041821} is an apocalyptic number.

It is an amenable number.

388384428041821 is a deficient number, since it is larger than the sum of its proper divisors (1).

388384428041821 is an equidigital number, since it uses as much as digits as its factorization.

388384428041821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75497472, while the sum is 64.

The spelling of 388384428041821 in words is "three hundred eighty-eight trillion, three hundred eighty-four billion, four hundred twenty-eight million, forty-one thousand, eight hundred twenty-one".