221968268 has 12 divisors (see below), whose sum is σ = 388577280. Its totient is φ = 110946192.

The previous prime is 221968261. The next prime is 221968321. The reversal of 221968268 is 862869122.

221968268 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221968261) by changing a digit.

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, 6773 + ... + 22131.

It is an arithmetic number, because the mean of its divisors is an integer number (32381440).

Almost surely, 2^221968268 is an apocalyptic number.

It is an amenable number.

221968268 is a deficient number, since it is larger than the sum of its proper divisors (166609012).

221968268 is a wasteful number, since it uses less digits than its factorization.

221968268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18976 (or 18974 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 221968268 is about 14898.5995314996. The cubic root of 221968268 is about 605.4760436048.

The spelling of 221968268 in words is "two hundred twenty-one million, nine hundred sixty-eight thousand, two hundred sixty-eight".