221435452 has 12 divisors (see below), whose sum is σ = 442870960. Its totient is φ = 94900896.

The previous prime is 221435441. The next prime is 221435497. The reversal of 221435452 is 254534122.

221435452 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 7908409 = 221435452 / (2 + 2 + 1 + 4 + 3 + 5 + 4 + 5 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 221435452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3954177 + ... + 3954232.

Almost surely, 2^221435452 is an apocalyptic number.

It is an amenable number.

221435452 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221435452 is a wasteful number, since it uses less digits than its factorization.

221435452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908420 (or 7908418 counting only the distinct ones).

The product of its digits is 9600, while the sum is 28.

The square root of 221435452 is about 14880.7073756593. The cubic root of 221435452 is about 604.9911908195.

Adding to 221435452 its reverse (254534122), we get a palindrome (475969574).

The spelling of 221435452 in words is "two hundred twenty-one million, four hundred thirty-five thousand, four hundred fifty-two".