221206452 has 24 divisors (see below), whose sum is σ = 532799232. Its totient is φ = 71356800.

The previous prime is 221206409. The next prime is 221206457. The reversal of 221206452 is 254602122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221206457) by changing a digit.

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, 296949 + ... + 297692.

It is an arithmetic number, because the mean of its divisors is an integer number (22199968).

Almost surely, 2^221206452 is an apocalyptic number.

It is an amenable number.

221206452 is an abundant number, since it is smaller than the sum of its proper divisors (311592780).

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

221206452 is a wasteful number, since it uses less digits than its factorization.

221206452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594679 (or 594677 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 221206452 is about 14873.0108585989. The cubic root of 221206452 is about 604.7825660374.

Adding to 221206452 its reverse (254602122), we get a palindrome (475808574).

The spelling of 221206452 in words is "two hundred twenty-one million, two hundred six thousand, four hundred fifty-two".