217126004205 has 32 divisors (see below), whose sum is σ = 379007815680. Its totient is φ = 105266479680.

The previous prime is 217126004177. The next prime is 217126004209. The reversal of 217126004205 is 502400621712.

It is not a de Polignac number, because 217126004205 - 2¹³ = 217125996013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217126004209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3390876 + ... + 3454314.

It is an arithmetic number, because the mean of its divisors is an integer number (11843994240).

Almost surely, 2^217126004205 is an apocalyptic number.

It is an amenable number.

217126004205 is a deficient number, since it is larger than the sum of its proper divisors (161881811475).

217126004205 is a wasteful number, since it uses less digits than its factorization.

217126004205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84201.

The product of its (nonzero) digits is 6720, while the sum is 30.

Adding to 217126004205 its reverse (502400621712), we get a palindrome (719526625917).

The spelling of 217126004205 in words is "two hundred seventeen billion, one hundred twenty-six million, four thousand, two hundred five".