842221990404 has 96 divisors (see below), whose sum is σ = 2207875084800. Its totient is φ = 277616471040.

The previous prime is 842221990373. The next prime is 842221990409. The reversal of 842221990404 is 404099122248.

842221990404 is a `hidden beast` number, since 8 + 4 + 22 + 219 + 9 + 0 + 404 = 666.

It is a super-2 number, since 2×842221990404² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 842221990404.

It is not an unprimeable number, because it can be changed into a prime (842221990409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12863302 + ... + 12928610.

It is an arithmetic number, because the mean of its divisors is an integer number (22998698800).

Almost surely, 2^842221990404 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 842221990404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1103937542400).

842221990404 is an abundant number, since it is smaller than the sum of its proper divisors (1365653094396).

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

842221990404 is a wasteful number, since it uses less digits than its factorization.

842221990404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66650 (or 66642 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 842221990404 in words is "eight hundred forty-two billion, two hundred twenty-one million, nine hundred ninety thousand, four hundred four".