556224221 has 16 divisors (see below), whose sum is σ = 684710400. Its totient is φ = 441162288.

The previous prime is 556224197. The next prime is 556224239. The reversal of 556224221 is 122422655.

It is not a de Polignac number, because 556224221 - 2¹⁰ = 556223197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556220221) 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, 42911 + ... + 54348.

It is an arithmetic number, because the mean of its divisors is an integer number (42794400).

Almost surely, 2^556224221 is an apocalyptic number.

It is an amenable number.

556224221 is a deficient number, since it is larger than the sum of its proper divisors (128486179).

556224221 is a wasteful number, since it uses less digits than its factorization.

556224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97328.

The product of its digits is 9600, while the sum is 29.

The square root of 556224221 is about 23584.4063101024. The cubic root of 556224221 is about 822.4003733693.

Adding to 556224221 its reverse (122422655), we get a palindrome (678646876).

The spelling of 556224221 in words is "five hundred fifty-six million, two hundred twenty-four thousand, two hundred twenty-one".