19121888344 has 64 divisors (see below), whose sum is σ = 40723603200. Its totient is φ = 8344550016.

The previous prime is 19121888323. The next prime is 19121888399. The reversal of 19121888344 is 44388812191.

It is a super-2 number, since 2×19121888344² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1024197 + ... + 1042699.

It is an arithmetic number, because the mean of its divisors is an integer number (636306300).

Almost surely, 2^19121888344 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 19121888344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20361801600).

19121888344 is an abundant number, since it is smaller than the sum of its proper divisors (21601714856).

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

19121888344 is a wasteful number, since it uses less digits than its factorization.

19121888344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19064 (or 19060 counting only the distinct ones).

The product of its digits is 442368, while the sum is 49.

The spelling of 19121888344 in words is "nineteen billion, one hundred twenty-one million, eight hundred eighty-eight thousand, three hundred forty-four".