217255321513 has 16 divisors (see below), whose sum is σ = 221748654976. Its totient is φ = 212799882240.

The previous prime is 217255321501. The next prime is 217255321529. The reversal of 217255321513 is 315123552712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217255321513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217255322513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50984803 + ... + 50989063.

It is an arithmetic number, because the mean of its divisors is an integer number (13859290936).

Almost surely, 2^217255321513 is an apocalyptic number.

It is an amenable number.

217255321513 is a deficient number, since it is larger than the sum of its proper divisors (4493333463).

217255321513 is a wasteful number, since it uses less digits than its factorization.

217255321513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8464.

The product of its digits is 63000, while the sum is 37.

The spelling of 217255321513 in words is "two hundred seventeen billion, two hundred fifty-five million, three hundred twenty-one thousand, five hundred thirteen".