217065139215 has 32 divisors (see below), whose sum is σ = 359484727296. Its totient is φ = 111728263680.

The previous prime is 217065139177. The next prime is 217065139237. The reversal of 217065139215 is 512931560712.

It is a happy number.

It is not a de Polignac number, because 217065139215 - 2⁸ = 217065138959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 465322 + ... + 806631.

It is an arithmetic number, because the mean of its divisors is an integer number (11233897728).

Almost surely, 2^217065139215 is an apocalyptic number.

217065139215 is a deficient number, since it is larger than the sum of its proper divisors (142419588081).

217065139215 is a wasteful number, since it uses less digits than its factorization.

217065139215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272359.

The product of its (nonzero) digits is 113400, while the sum is 42.

Adding to 217065139215 its reverse (512931560712), we get a palindrome (729996699927).

The spelling of 217065139215 in words is "two hundred seventeen billion, sixty-five million, one hundred thirty-nine thousand, two hundred fifteen".