556102221 has 4 divisors (see below), whose sum is σ = 741469632. Its totient is φ = 370734812.

The previous prime is 556102201. The next prime is 556102223. The reversal of 556102221 is 122201655.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 556102221 - 2¹⁵ = 556069453 is a prime.

It is a super-2 number, since 2×556102221² = 618499360402265682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 556102191 and 556102200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556102223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92683701 + ... + 92683706.

It is an arithmetic number, because the mean of its divisors is an integer number (185367408).

Almost surely, 2^556102221 is an apocalyptic number.

It is an amenable number.

556102221 is a deficient number, since it is larger than the sum of its proper divisors (185367411).

556102221 is a wasteful number, since it uses less digits than its factorization.

556102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185367410.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 556102221 is about 23581.8197134996. The cubic root of 556102221 is about 822.3402416345.

Adding to 556102221 its reverse (122201655), we get a palindrome (678303876).

The spelling of 556102221 in words is "five hundred fifty-six million, one hundred two thousand, two hundred twenty-one".