221245552 has 20 divisors (see below), whose sum is σ = 467633016. Its totient is φ = 100566080.

The previous prime is 221245523. The next prime is 221245571. The reversal of 221245552 is 255542122.

It is a self number, because there is not a number n which added to its sum of digits gives 221245552.

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, 628363 + ... + 628714.

Almost surely, 2^221245552 is an apocalyptic number.

221245552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221245552 is an abundant number, since it is smaller than the sum of its proper divisors (246387464).

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

221245552 is a wasteful number, since it uses less digits than its factorization.

221245552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257096 (or 1257090 counting only the distinct ones).

The product of its digits is 8000, while the sum is 28.

The square root of 221245552 is about 14874.3252620077. The cubic root of 221245552 is about 604.8181973146.

Adding to 221245552 its reverse (255542122), we get a palindrome (476787674).

The spelling of 221245552 in words is "two hundred twenty-one million, two hundred forty-five thousand, five hundred fifty-two".