19989504217 has 8 divisors (see below), whose sum is σ = 21022857216. Its totient is φ = 18969838272.

The previous prime is 19989504151. The next prime is 19989504229. The reversal of 19989504217 is 71240598991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19989504217 - 2⁷ = 19989504089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19989504317) 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 in 7 ways as a sum of consecutive naturals, for example, 3418768 + ... + 3424609.

It is an arithmetic number, because the mean of its divisors is an integer number (2627857152).

Almost surely, 2^19989504217 is an apocalyptic number.

It is an amenable number.

19989504217 is a deficient number, since it is larger than the sum of its proper divisors (1033352999).

19989504217 is a wasteful number, since it uses less digits than its factorization.

19989504217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6843527.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 19989504217 in words is "nineteen billion, nine hundred eighty-nine million, five hundred four thousand, two hundred seventeen".