18421843216 has 60 divisors (see below), whose sum is σ = 41581637712. Its totient is φ = 7883287104.

The previous prime is 18421843211. The next prime is 18421843249. The reversal of 18421843216 is 61234812481.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18421843211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 518271 + ... + 552673.

Almost surely, 2^18421843216 is an apocalyptic number.

18421843216 is a gapful number since it is divisible by the number (16) 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 18421843216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20790818856).

18421843216 is an abundant number, since it is smaller than the sum of its proper divisors (23159794496).

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

18421843216 is a wasteful number, since it uses less digits than its factorization.

18421843216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35108 (or 35095 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The spelling of 18421843216 in words is "eighteen billion, four hundred twenty-one million, eight hundred forty-three thousand, two hundred sixteen".