384321659921 has 2 divisors, whose sum is σ = 384321659922. Its totient is φ = 384321659920.

The previous prime is 384321659857. The next prime is 384321659927. The reversal of 384321659921 is 129956123483.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380887699921 + 3433960000 = 617161^2 + 58600^2 .

It is a cyclic number.

It is not a de Polignac number, because 384321659921 - 2⁶ = 384321659857 is a prime.

It is not a weakly prime, because it can be changed into another prime (384321659927) 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 as a sum of consecutive naturals, namely, 192160829960 + 192160829961.

It is an arithmetic number, because the mean of its divisors is an integer number (192160829961).

Almost surely, 2^384321659921 is an apocalyptic number.

It is an amenable number.

384321659921 is a deficient number, since it is larger than the sum of its proper divisors (1).

384321659921 is an equidigital number, since it uses as much as digits as its factorization.

384321659921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 53.

The spelling of 384321659921 in words is "three hundred eighty-four billion, three hundred twenty-one million, six hundred fifty-nine thousand, nine hundred twenty-one".