221632252 has 6 divisors (see below), whose sum is σ = 387856448. Its totient is φ = 110816124.

The previous prime is 221632199. The next prime is 221632253. The reversal of 221632252 is 252236122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221632253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27704028 + ... + 27704035.

Almost surely, 2^221632252 is an apocalyptic number.

It is an amenable number.

221632252 is a deficient number, since it is larger than the sum of its proper divisors (166224196).

221632252 is a wasteful number, since it uses less digits than its factorization.

221632252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55408067 (or 55408065 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 221632252 is about 14887.3184959549. The cubic root of 221632252 is about 605.1703656996.

Adding to 221632252 its reverse (252236122), we get a palindrome (473868374).

The spelling of 221632252 in words is "two hundred twenty-one million, six hundred thirty-two thousand, two hundred fifty-two".