556221 has 8 divisors (see below), whose sum is σ = 761824. Its totient is φ = 360720.

The previous prime is 556219. The next prime is 556229. The reversal of 556221 is 122655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 556221 - 2¹ = 556219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 556221.

It is not an unprimeable number, because it can be changed into a prime (556229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2395 + ... + 2616.

It is an arithmetic number, because the mean of its divisors is an integer number (95228).

2⁵⁵⁶²²¹ is an apocalyptic number.

It is an amenable number.

556221 is a deficient number, since it is larger than the sum of its proper divisors (205603).

556221 is a wasteful number, since it uses less digits than its factorization.

556221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051.

The product of its digits is 600, while the sum is 21.

The square root of 556221 is about 745.8022526112. The cubic root of 556221 is about 82.2398785906.

Adding to 556221 its reverse (122655), we get a palindrome (678876).

It can be divided in two parts, 556 and 221, that added together give a palindrome (777).

The spelling of 556221 in words is "five hundred fifty-six thousand, two hundred twenty-one".