217013255 has 4 divisors (see below), whose sum is σ = 260415912. Its totient is φ = 173610600.

The previous prime is 217013249. The next prime is 217013261. The reversal of 217013255 is 552310712.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (217013249) and next prime (217013261).

It is not a de Polignac number, because 217013255 - 2⁶ = 217013191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21701321 + ... + 21701330.

It is an arithmetic number, because the mean of its divisors is an integer number (65103978).

Almost surely, 2^217013255 is an apocalyptic number.

217013255 is a deficient number, since it is larger than the sum of its proper divisors (43402657).

217013255 is an equidigital number, since it uses as much as digits as its factorization.

217013255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43402656.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 217013255 is about 14731.3697598017. The cubic root of 217013255 is about 600.9367358562.

Adding to 217013255 its reverse (552310712), we get a palindrome (769323967).

The spelling of 217013255 in words is "two hundred seventeen million, thirteen thousand, two hundred fifty-five".