221268556 has 12 divisors (see below), whose sum is σ = 404055792. Its totient is φ = 105824048.

The previous prime is 221268539. The next prime is 221268559. The reversal of 221268556 is 655862122.

It is not an unprimeable number, because it can be changed into a prime (221268559) by changing a digit.

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, 1202455 + ... + 1202638.

It is an arithmetic number, because the mean of its divisors is an integer number (33671316).

Almost surely, 2^221268556 is an apocalyptic number.

It is an amenable number.

221268556 is a deficient number, since it is larger than the sum of its proper divisors (182787236).

221268556 is a wasteful number, since it uses less digits than its factorization.

221268556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405120 (or 2405118 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 221268556 is about 14875.0985206821. The cubic root of 221268556 is about 604.8391585731.

The spelling of 221268556 in words is "two hundred twenty-one million, two hundred sixty-eight thousand, five hundred fifty-six".