19385121008 has 40 divisors (see below), whose sum is σ = 40981900800. Its totient is φ = 8809525440.

The previous prime is 19385120987. The next prime is 19385121031. The reversal of 19385121008 is 80012158391.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111943 + ... + 1129241.

It is an arithmetic number, because the mean of its divisors is an integer number (1024547520).

Almost surely, 2^19385121008 is an apocalyptic number.

It is an amenable number.

19385121008 is an abundant number, since it is smaller than the sum of its proper divisors (21596779792).

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

19385121008 is a wasteful number, since it uses less digits than its factorization.

19385121008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23685 (or 23679 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

Adding to 19385121008 its reverse (80012158391), we get a palindrome (99397279399).

The spelling of 19385121008 in words is "nineteen billion, three hundred eighty-five million, one hundred twenty-one thousand, eight".