221331252 has 24 divisors (see below), whose sum is σ = 522244800. Its totient is φ = 72947776.

The previous prime is 221331251. The next prime is 221331281. The reversal of 221331252 is 252133122.

It is a super-2 number, since 2×221331252² = 97975046223775008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221331251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102552 + ... + 104687.

It is an arithmetic number, because the mean of its divisors is an integer number (21760200).

Almost surely, 2^221331252 is an apocalyptic number.

It is an amenable number.

221331252 is an abundant number, since it is smaller than the sum of its proper divisors (300913548).

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

221331252 is a wasteful number, since it uses less digits than its factorization.

221331252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207335 (or 207333 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 221331252 is about 14877.2057860339. The cubic root of 221331252 is about 604.8962798311.

Adding to 221331252 its reverse (252133122), we get a palindrome (473464374).

The spelling of 221331252 in words is "two hundred twenty-one million, three hundred thirty-one thousand, two hundred fifty-two".