221242044 has 48 divisors (see below), whose sum is σ = 535842720. Its totient is φ = 70963200.

The previous prime is 221242039. The next prime is 221242051. The reversal of 221242044 is 440242122.

It is a self number, because there is not a number n which added to its sum of digits gives 221242044.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 121944 + ... + 123744.

It is an arithmetic number, because the mean of its divisors is an integer number (11163390).

Almost surely, 2^221242044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221242044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267921360).

221242044 is an abundant number, since it is smaller than the sum of its proper divisors (314600676).

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

221242044 is a wasteful number, since it uses less digits than its factorization.

221242044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190 (or 2188 counting only the distinct ones).

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

The square root of 221242044 is about 14874.2073402249. The cubic root of 221242044 is about 604.8150006952.

Adding to 221242044 its reverse (440242122), we get a palindrome (661484166).

The spelling of 221242044 in words is "two hundred twenty-one million, two hundred forty-two thousand, forty-four".