217187052005 has 16 divisors (see below), whose sum is σ = 324934395264. Its totient is φ = 135389330880.

The previous prime is 217187051971. The next prime is 217187052007. The reversal of 217187052005 is 500250781712.

It is not a de Polignac number, because 217187052005 - 2¹⁰ = 217187050981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217187052005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217187052007) 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, 282060722 + ... + 282061491.

It is an arithmetic number, because the mean of its divisors is an integer number (20308399704).

Almost surely, 2^217187052005 is an apocalyptic number.

It is an amenable number.

217187052005 is a deficient number, since it is larger than the sum of its proper divisors (107747343259).

217187052005 is a wasteful number, since it uses less digits than its factorization.

217187052005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564122236.

The product of its (nonzero) digits is 39200, while the sum is 38.

The spelling of 217187052005 in words is "two hundred seventeen billion, one hundred eighty-seven million, fifty-two thousand, five".