19316821824 has 84 divisors (see below), whose sum is σ = 55419341536. Its totient is φ = 6432991488.

The previous prime is 19316821817. The next prime is 19316821859. The reversal of 19316821824 is 42812861391.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 19316821824.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 631917 + ... + 661779.

Almost surely, 2^19316821824 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 19316821824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27709670768).

19316821824 is an abundant number, since it is smaller than the sum of its proper divisors (36102519712).

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

19316821824 is a wasteful number, since it uses less digits than its factorization.

19316821824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31004 (or 30991 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The spelling of 19316821824 in words is "nineteen billion, three hundred sixteen million, eight hundred twenty-one thousand, eight hundred twenty-four".