556711221 has 8 divisors (see below), whose sum is σ = 809761824. Its totient is φ = 337400720.

The previous prime is 556711157. The next prime is 556711261. The reversal of 556711221 is 122117655.

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

It is a cyclic number.

It is not a de Polignac number, because 556711221 - 2⁶ = 556711157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556711261) 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, 8434986 + ... + 8435051.

It is an arithmetic number, because the mean of its divisors is an integer number (101220228).

Almost surely, 2^556711221 is an apocalyptic number.

It is an amenable number.

556711221 is a deficient number, since it is larger than the sum of its proper divisors (253050603).

556711221 is a wasteful number, since it uses less digits than its factorization.

556711221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16870051.

The product of its digits is 4200, while the sum is 30.

The square root of 556711221 is about 23594.7286697686. The cubic root of 556711221 is about 822.6403198606.

Adding to 556711221 its reverse (122117655), we get a palindrome (678828876).

The spelling of 556711221 in words is "five hundred fifty-six million, seven hundred eleven thousand, two hundred twenty-one".