221938168 has 16 divisors (see below), whose sum is σ = 416295000. Its totient is φ = 110926176.

The previous prime is 221938163. The next prime is 221938169. The reversal of 221938168 is 861839122.

221938168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221938168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221938163) 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, 31603 + ... + 37981.

Almost surely, 2^221938168 is an apocalyptic number.

It is an amenable number.

221938168 is a deficient number, since it is larger than the sum of its proper divisors (194356832).

221938168 is a wasteful number, since it uses less digits than its factorization.

221938168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10734 (or 10730 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 221938168 is about 14897.5893351911. The cubic root of 221938168 is about 605.4486738476.

The spelling of 221938168 in words is "two hundred twenty-one million, nine hundred thirty-eight thousand, one hundred sixty-eight".