19988321399 has 2 divisors, whose sum is σ = 19988321400. Its totient is φ = 19988321398.

The previous prime is 19988321359. The next prime is 19988321443. The reversal of 19988321399 is 99312388991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19988321399 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19988321359) 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, 9994160699 + 9994160700.

It is an arithmetic number, because the mean of its divisors is an integer number (9994160700).

Almost surely, 2^19988321399 is an apocalyptic number.

19988321399 is a deficient number, since it is larger than the sum of its proper divisors (1).

19988321399 is an equidigital number, since it uses as much as digits as its factorization.

19988321399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 62.

The spelling of 19988321399 in words is "nineteen billion, nine hundred eighty-eight million, three hundred twenty-one thousand, three hundred ninety-nine".