221044240 has 20 divisors (see below), whose sum is σ = 513928044. Its totient is φ = 88417664.

The previous prime is 221044223. The next prime is 221044289. The reversal of 221044240 is 42440122.

221044240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 58430736 + 162613504 = 7644^2 + 12752^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 1381447 + ... + 1381606.

Almost surely, 2^221044240 is an apocalyptic number.

221044240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221044240 is an abundant number, since it is smaller than the sum of its proper divisors (292883804).

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

221044240 is a wasteful number, since it uses less digits than its factorization.

221044240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763066 (or 2763060 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 221044240 is about 14867.5566250813. The cubic root of 221044240 is about 604.6346996765.

Adding to 221044240 its reverse (42440122), we get a palindrome (263484362).

The spelling of 221044240 in words is "two hundred twenty-one million, forty-four thousand, two hundred forty".