221368568 has 16 divisors (see below), whose sum is σ = 419177160. Its totient is φ = 109588000.

The previous prime is 221368561. The next prime is 221368591. The reversal of 221368568 is 865863122.

221368568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221368561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136178 + ... + 137793.

Almost surely, 2^221368568 is an apocalyptic number.

It is an amenable number.

221368568 is a deficient number, since it is larger than the sum of its proper divisors (197808592).

221368568 is a wasteful number, since it uses less digits than its factorization.

221368568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274078 (or 274074 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 221368568 is about 14878.4598665319. The cubic root of 221368568 is about 604.9302726826.

The spelling of 221368568 in words is "two hundred twenty-one million, three hundred sixty-eight thousand, five hundred sixty-eight".