221768855956 has 12 divisors (see below), whose sum is σ = 404969215392. Its totient is φ = 106063365848.

The previous prime is 221768855929. The next prime is 221768855981. The reversal of 221768855956 is 659558867122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205265430 + ... + 1205265613.

It is an arithmetic number, because the mean of its divisors is an integer number (33747434616).

Almost surely, 2^221768855956 is an apocalyptic number.

It is an amenable number.

221768855956 is a deficient number, since it is larger than the sum of its proper divisors (183200359436).

221768855956 is a wasteful number, since it uses less digits than its factorization.

221768855956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410531070 (or 2410531068 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 64.

The spelling of 221768855956 in words is "two hundred twenty-one billion, seven hundred sixty-eight million, eight hundred fifty-five thousand, nine hundred fifty-six".