221325244 has 96 divisors (see below), whose sum is σ = 494678016. Its totient is φ = 84464640.

The previous prime is 221325241. The next prime is 221325253. The reversal of 221325244 is 442523122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221325241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 781927 + ... + 782209.

It is an arithmetic number, because the mean of its divisors is an integer number (5152896).

Almost surely, 2^221325244 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 221325244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247339008).

221325244 is an abundant number, since it is smaller than the sum of its proper divisors (273352772).

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

221325244 is a wasteful number, since it uses less digits than its factorization.

221325244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 393 counting only the distinct ones).

The product of its digits is 3840, while the sum is 25.

The square root of 221325244 is about 14877.0038650260. The cubic root of 221325244 is about 604.8908065120.

Adding to 221325244 its reverse (442523122), we get a palindrome (663848366).

The spelling of 221325244 in words is "two hundred twenty-one million, three hundred twenty-five thousand, two hundred forty-four".