555244221 has 16 divisors (see below), whose sum is σ = 860428800. Its totient is φ = 311904048.

The previous prime is 555244189. The next prime is 555244223. The reversal of 555244221 is 122442555.

It is not a de Polignac number, because 555244221 - 2⁵ = 555244189 is a prime.

It is a super-2 number, since 2×555244221² = 616592289907793682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555244223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222831 + ... + 225308.

It is an arithmetic number, because the mean of its divisors is an integer number (53776800).

Almost surely, 2^555244221 is an apocalyptic number.

It is an amenable number.

555244221 is a deficient number, since it is larger than the sum of its proper divisors (305184579).

555244221 is a wasteful number, since it uses less digits than its factorization.

555244221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448208.

The product of its digits is 16000, while the sum is 30.

The square root of 555244221 is about 23563.6207107482. The cubic root of 555244221 is about 821.9170993408.

Adding to 555244221 its reverse (122442555), we get a palindrome (677686776).

The spelling of 555244221 in words is "five hundred fifty-five million, two hundred forty-four thousand, two hundred twenty-one".