19201020012 has 18 divisors (see below), whose sum is σ = 48535911788. Its totient is φ = 6400339992.

The previous prime is 19201019947. The next prime is 19201020049. The reversal of 19201020012 is 21002010291.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 266680798 + ... + 266680869.

Almost surely, 2^19201020012 is an apocalyptic number.

19201020012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19201020012 is an abundant number, since it is smaller than the sum of its proper divisors (29334891776).

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

19201020012 is a wasteful number, since it uses less digits than its factorization.

19201020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533361677 (or 533361672 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 19201020012 in words is "nineteen billion, two hundred one million, twenty thousand, twelve".