517217016027221 has 16 divisors (see below), whose sum is σ = 548603508699840. Its totient is φ = 486247094012160.

The previous prime is 517217016027209. The next prime is 517217016027269. The reversal of 517217016027221 is 122720610712715.

It is a cyclic number.

It is not a de Polignac number, because 517217016027221 - 2²⁶ = 517216948918357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517217016027121) 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, 161978531 + ... + 165140783.

It is an arithmetic number, because the mean of its divisors is an integer number (34287719293740).

Almost surely, 2^{517217016027221} is an apocalyptic number.

It is an amenable number.

517217016027221 is a deficient number, since it is larger than the sum of its proper divisors (31386492672619).

517217016027221 is a wasteful number, since it uses less digits than its factorization.

517217016027221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228116.

The product of its (nonzero) digits is 164640, while the sum is 44.

Adding to 517217016027221 its reverse (122720610712715), we get a palindrome (639937626739936).

The spelling of 517217016027221 in words is "five hundred seventeen trillion, two hundred seventeen billion, sixteen million, twenty-seven thousand, two hundred twenty-one".