217140256 has 24 divisors (see below), whose sum is σ = 427823424. Its totient is φ = 108486720.

The previous prime is 217140251. The next prime is 217140257. The reversal of 217140256 is 652041712.

217140256 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 (217140251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78741 + ... + 81451.

It is an arithmetic number, because the mean of its divisors is an integer number (17825976).

Almost surely, 2^217140256 is an apocalyptic number.

It is an amenable number.

217140256 is a deficient number, since it is larger than the sum of its proper divisors (210683168).

217140256 is a wasteful number, since it uses less digits than its factorization.

217140256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5224 (or 5216 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 217140256 is about 14735.6796925015. The cubic root of 217140256 is about 601.0539401921.

Adding to 217140256 its reverse (652041712), we get a palindrome (869181968).

The spelling of 217140256 in words is "two hundred seventeen million, one hundred forty thousand, two hundred fifty-six".