221004444 has 24 divisors (see below), whose sum is σ = 521473680. Its totient is φ = 72840064.

The previous prime is 221004431. The next prime is 221004449. The reversal of 221004444 is 444400122.

221004444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221004444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221004449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102399 + ... + 104534.

It is an arithmetic number, because the mean of its divisors is an integer number (21728070).

Almost surely, 2^221004444 is an apocalyptic number.

It is an amenable number.

221004444 is an abundant number, since it is smaller than the sum of its proper divisors (300469236).

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

221004444 is a wasteful number, since it uses less digits than its factorization.

221004444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207029 (or 207027 counting only the distinct ones).

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

The square root of 221004444 is about 14866.2182144619. The cubic root of 221004444 is about 604.5984120889.

Adding to 221004444 its reverse (444400122), we get a palindrome (665404566).

The spelling of 221004444 in words is "two hundred twenty-one million, four thousand, four hundred forty-four".