19012421736 has 320 divisors, whose sum is σ = 69283399680. Its totient is φ = 4723297920.

The previous prime is 19012421719. The next prime is 19012421741. The reversal of 19012421736 is 63712421091.

19012421736 is a `hidden beast` number, since 190 + 12 + 421 + 7 + 36 = 666.

It is a super-2 number, since 2×19012421736² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 19012421736.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1139325 + ... + 1155891.

It is an arithmetic number, because the mean of its divisors is an integer number (216510624).

Almost surely, 2^19012421736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19012421736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34641699840).

19012421736 is an abundant number, since it is smaller than the sum of its proper divisors (50270977944).

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

19012421736 is a wasteful number, since it uses less digits than its factorization.

19012421736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16626 (or 16613 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 19012421736 in words is "nineteen billion, twelve million, four hundred twenty-one thousand, seven hundred thirty-six".