217273354366129 has 2 divisors, whose sum is σ = 217273354366130. Its totient is φ = 217273354366128.

The previous prime is 217273354366093. The next prime is 217273354366141. The reversal of 217273354366129 is 921663453372712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135251713069729 + 82021641296400 = 11629777^2 + 9056580^2 .

It is a cyclic number.

It is not a de Polignac number, because 217273354366129 - 2⁷ = 217273354366001 is a prime.

It is not a weakly prime, because it can be changed into another prime (217273354366169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108636677183064 + 108636677183065.

It is an arithmetic number, because the mean of its divisors is an integer number (108636677183065).

Almost surely, 2^{217273354366129} is an apocalyptic number.

It is an amenable number.

217273354366129 is a deficient number, since it is larger than the sum of its proper divisors (1).

217273354366129 is an equidigital number, since it uses as much as digits as its factorization.

217273354366129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68584320, while the sum is 61.

The spelling of 217273354366129 in words is "two hundred seventeen trillion, two hundred seventy-three billion, three hundred fifty-four million, three hundred sixty-six thousand, one hundred twenty-nine".