19081320012 has 90 divisors (see below), whose sum is σ = 51544195164. Its totient is φ = 6155164080.

The previous prime is 19081319969. The next prime is 19081320023. The reversal of 19081320012 is 21002318091.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 280723 + ... + 342005.

Almost surely, 2^19081320012 is an apocalyptic number.

19081320012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19081320012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25772097582).

19081320012 is an abundant number, since it is smaller than the sum of its proper divisors (32462875152).

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

19081320012 is a wasteful number, since it uses less digits than its factorization.

19081320012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61361 (or 61319 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 19081320012 in words is "nineteen billion, eighty-one million, three hundred twenty thousand, twelve".