221042244 has 24 divisors (see below), whose sum is σ = 517595680. Its totient is φ = 73419264.

The previous prime is 221042221. The next prime is 221042281. The reversal of 221042244 is 442240122.

It is a self number, because there is not a number n which added to its sum of digits gives 221042244.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29149 + ... + 35940.

Almost surely, 2^221042244 is an apocalyptic number.

It is an amenable number.

221042244 is an abundant number, since it is smaller than the sum of its proper divisors (296553436).

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

221042244 is a wasteful number, since it uses less digits than its factorization.

221042244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65379 (or 65377 counting only the distinct ones).

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

The square root of 221042244 is about 14867.4894989033. The cubic root of 221042244 is about 604.6328797475.

Adding to 221042244 its reverse (442240122), we get a palindrome (663282366).

The spelling of 221042244 in words is "two hundred twenty-one million, forty-two thousand, two hundred forty-four".