19988321398 has 32 divisors (see below), whose sum is σ = 31727064960. Its totient is φ = 9429087360.

The previous prime is 19988321359. The next prime is 19988321399. The reversal of 19988321398 is 89312388991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19988321399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1796340 + ... + 1807432.

It is an arithmetic number, because the mean of its divisors is an integer number (991470780).

Almost surely, 2^19988321398 is an apocalyptic number.

19988321398 is a deficient number, since it is larger than the sum of its proper divisors (11738743562).

19988321398 is a wasteful number, since it uses less digits than its factorization.

19988321398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11832.

The product of its digits is 6718464, while the sum is 61.

The spelling of 19988321398 in words is "nineteen billion, nine hundred eighty-eight million, three hundred twenty-one thousand, three hundred ninety-eight".