221243372 has 72 divisors (see below), whose sum is σ = 495129600. Its totient is φ = 84485376.

The previous prime is 221243369. The next prime is 221243377. The reversal of 221243372 is 273342122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221243377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153029 + ... + 154467.

It is an arithmetic number, because the mean of its divisors is an integer number (6876800).

Almost surely, 2^221243372 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 221243372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247564800).

221243372 is an abundant number, since it is smaller than the sum of its proper divisors (273886228).

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

221243372 is a wasteful number, since it uses less digits than its factorization.

221243372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503 (or 1484 counting only the distinct ones).

The product of its digits is 4032, while the sum is 26.

The square root of 221243372 is about 14874.2519811922. The cubic root of 221243372 is about 604.8162108219.

Adding to 221243372 its reverse (273342122), we get a palindrome (494585494).

The spelling of 221243372 in words is "two hundred twenty-one million, two hundred forty-three thousand, three hundred seventy-two".