221044404 has 96 divisors (see below), whose sum is σ = 657054720. Its totient is φ = 56305152.

The previous prime is 221044391. The next prime is 221044451. The reversal of 221044404 is 404440122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23059 + ... + 31205.

It is an arithmetic number, because the mean of its divisors is an integer number (6844320).

Almost surely, 2^221044404 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 221044404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328527360).

221044404 is an abundant number, since it is smaller than the sum of its proper divisors (436010316).

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

221044404 is a wasteful number, since it uses less digits than its factorization.

221044404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8197 (or 8195 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 221044404 is about 14867.5621404452. The cubic root of 221044404 is about 604.6348492093.

Adding to 221044404 its reverse (404440122), we get a palindrome (625484526).

The spelling of 221044404 in words is "two hundred twenty-one million, forty-four thousand, four hundred four".