221343252 has 24 divisors (see below), whose sum is σ = 556196256. Its totient is φ = 68105568.

The previous prime is 221343251. The next prime is 221343253. The reversal of 221343252 is 252343122.

It is an interprime number because it is at equal distance from previous prime (221343251) and next prime (221343253).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221343251) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 709278 + ... + 709589.

It is an arithmetic number, because the mean of its divisors is an integer number (23174844).

Almost surely, 2^221343252 is an apocalyptic number.

It is an amenable number.

221343252 is an abundant number, since it is smaller than the sum of its proper divisors (334853004).

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

221343252 is a wasteful number, since it uses less digits than its factorization.

221343252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418887 (or 1418885 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 221343252 is about 14877.6090821072. The cubic root of 221343252 is about 604.9072115969.

Adding to 221343252 its reverse (252343122), we get a palindrome (473686374).

The spelling of 221343252 in words is "two hundred twenty-one million, three hundred forty-three thousand, two hundred fifty-two".