221600056 has 32 divisors (see below), whose sum is σ = 422193600. Its totient is φ = 109025280.

The previous prime is 221600053. The next prime is 221600063. The reversal of 221600056 is 650006122.

221600056 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 (221600051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328936 + ... + 329608.

It is an arithmetic number, because the mean of its divisors is an integer number (13193550).

Almost surely, 2^221600056 is an apocalyptic number.

It is an amenable number.

221600056 is a deficient number, since it is larger than the sum of its proper divisors (200593544).

221600056 is a wasteful number, since it uses less digits than its factorization.

221600056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1275 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 221600056 is about 14886.2371336748. The cubic root of 221600056 is about 605.1410603850.

Adding to 221600056 its reverse (650006122), we get a palindrome (871606178).

The spelling of 221600056 in words is "two hundred twenty-one million, six hundred thousand, fifty-six".