221055556 has 12 divisors (see below), whose sum is σ = 409603068. Its totient is φ = 104026112.

The previous prime is 221055533. The next prime is 221055577. The reversal of 221055556 is 655550122.

It can be written as a sum of positive squares in 2 ways, for example, as 175032900 + 46022656 = 13230^2 + 6784^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1625341 + ... + 1625476.

It is an arithmetic number, because the mean of its divisors is an integer number (34133589).

Almost surely, 2^221055556 is an apocalyptic number.

It is an amenable number.

221055556 is a deficient number, since it is larger than the sum of its proper divisors (188547512).

221055556 is a wasteful number, since it uses less digits than its factorization.

221055556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3250838 (or 3250836 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 221055556 is about 14867.9371803892. The cubic root of 221055556 is about 604.6450172635.

It can be divided in two parts, 22 and 1055556, that multiplied together give a palindrome (23222232).

The spelling of 221055556 in words is "two hundred twenty-one million, fifty-five thousand, five hundred fifty-six".