221044650 has 24 divisors (see below), whose sum is σ = 548191104. Its totient is φ = 58945200.

The previous prime is 221044631. The next prime is 221044679. The reversal of 221044650 is 56440122.

It is a self number, because there is not a number n which added to its sum of digits gives 221044650.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 736666 + ... + 736965.

It is an arithmetic number, because the mean of its divisors is an integer number (22841296).

Almost surely, 2^221044650 is an apocalyptic number.

221044650 is an abundant number, since it is smaller than the sum of its proper divisors (327146454).

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

221044650 is a wasteful number, since it uses less digits than its factorization.

221044650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473646 (or 1473641 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 221044650 is about 14867.5704134872. The cubic root of 221044650 is about 604.6350735083.

Adding to 221044650 its reverse (56440122), we get a palindrome (277484772).

The spelling of 221044650 in words is "two hundred twenty-one million, forty-four thousand, six hundred fifty".