19993421888 has 28 divisors (see below), whose sum is σ = 43281215952. Its totient is φ = 9087918720.

The previous prime is 19993421887. The next prime is 19993421891. The reversal of 19993421888 is 88812439991.

It is a self number, because there is not a number n which added to its sum of digits gives 19993421888.

It is not an unprimeable number, because it can be changed into a prime (19993421887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14199170 + ... + 14200577.

Almost surely, 2^19993421888 is an apocalyptic number.

It is an amenable number.

19993421888 is an abundant number, since it is smaller than the sum of its proper divisors (23287794064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19993421888 is a wasteful number, since it uses less digits than its factorization.

19993421888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28399770 (or 28399760 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 62.

The spelling of 19993421888 in words is "nineteen billion, nine hundred ninety-three million, four hundred twenty-one thousand, eight hundred eighty-eight".