217106205052 has 24 divisors (see below), whose sum is σ = 416957385600. Its totient is φ = 98093709360.

The previous prime is 217106205031. The next prime is 217106205053. The reversal of 217106205052 is 250502601712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217106205053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14765802 + ... + 14780497.

It is an arithmetic number, because the mean of its divisors is an integer number (17373224400).

Almost surely, 2^217106205052 is an apocalyptic number.

217106205052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

217106205052 is a deficient number, since it is larger than the sum of its proper divisors (199851180548).

217106205052 is a wasteful number, since it uses less digits than its factorization.

217106205052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29546481 (or 29546479 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

Adding to 217106205052 its reverse (250502601712), we get a palindrome (467608806764).

The spelling of 217106205052 in words is "two hundred seventeen billion, one hundred six million, two hundred five thousand, fifty-two".