221330244 has 24 divisors (see below), whose sum is σ = 517050688. Its totient is φ = 73689120.

The previous prime is 221330243. The next prime is 221330251. The reversal of 221330244 is 442033122.

It is a self number, because there is not a number n which added to its sum of digits gives 221330244.

It is not an unprimeable number, because it can be changed into a prime (221330243) by changing a digit.

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, 9 + ... + 21039.

Almost surely, 2^221330244 is an apocalyptic number.

It is an amenable number.

221330244 is an abundant number, since it is smaller than the sum of its proper divisors (295720444).

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

221330244 is a wasteful number, since it uses less digits than its factorization.

221330244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21915 (or 21913 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221330244 is about 14877.1719086660. The cubic root of 221330244 is about 604.8953615448.

Adding to 221330244 its reverse (442033122), we get a palindrome (663363366).

It can be divided in two parts, 2 and 21330244, that added together give a triangular number (21330246 = T₆₅₃₁).

The spelling of 221330244 in words is "two hundred twenty-one million, three hundred thirty thousand, two hundred forty-four".