221712252 has 24 divisors (see below), whose sum is σ = 518332416. Its totient is φ = 73760688.

The previous prime is 221712241. The next prime is 221712263. The reversal of 221712252 is 252217122.

It is an interprime number because it is at equal distance from previous prime (221712241) and next prime (221712263).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11388 + ... + 23939.

It is an arithmetic number, because the mean of its divisors is an integer number (21597184).

Almost surely, 2^221712252 is an apocalyptic number.

It is an amenable number.

221712252 is an abundant number, since it is smaller than the sum of its proper divisors (296620164).

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

221712252 is a wasteful number, since it uses less digits than its factorization.

221712252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35857 (or 35855 counting only the distinct ones).

The product of its digits is 1120, while the sum is 24.

The square root of 221712252 is about 14890.0051040958. The cubic root of 221712252 is about 605.2431706951.

Adding to 221712252 its reverse (252217122), we get a palindrome (473929374).

The spelling of 221712252 in words is "two hundred twenty-one million, seven hundred twelve thousand, two hundred fifty-two".