8438438421499 has 2 divisors, whose sum is σ = 8438438421500. Its totient is φ = 8438438421498.

The previous prime is 8438438421337. The next prime is 8438438421533. The reversal of 8438438421499 is 9941248348348.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8438438421499 - 2¹⁷ = 8438438290427 is a prime.

It is not a weakly prime, because it can be changed into another prime (8438438424499) 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, 4219219210749 + 4219219210750.

It is an arithmetic number, because the mean of its divisors is an integer number (4219219210750).

Almost surely, 2^{8438438421499} is an apocalyptic number.

8438438421499 is a deficient number, since it is larger than the sum of its proper divisors (1).

8438438421499 is an equidigital number, since it uses as much as digits as its factorization.

8438438421499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 191102976, while the sum is 67.

The spelling of 8438438421499 in words is "eight trillion, four hundred thirty-eight billion, four hundred thirty-eight million, four hundred twenty-one thousand, four hundred ninety-nine".