221130444 has 12 divisors (see below), whose sum is σ = 515971064. Its totient is φ = 73710144.

The previous prime is 221130433. The next prime is 221130449. The reversal of 221130444 is 444031122.

221130444 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

221130444 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 221130444.

It is not an unprimeable number, because it can be changed into a prime (221130449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9213757 + ... + 9213780.

Almost surely, 2^221130444 is an apocalyptic number.

It is an amenable number.

221130444 is an abundant number, since it is smaller than the sum of its proper divisors (294840620).

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

221130444 is a wasteful number, since it uses less digits than its factorization.

221130444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18427544 (or 18427542 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 221130444 is about 14870.4554066108. The cubic root of 221130444 is about 604.7132890056.

Adding to 221130444 its reverse (444031122), we get a palindrome (665161566).

The spelling of 221130444 in words is "two hundred twenty-one million, one hundred thirty thousand, four hundred forty-four".