217121570671289 has 2 divisors, whose sum is σ = 217121570671290. Its totient is φ = 217121570671288.

The previous prime is 217121570671283. The next prime is 217121570671309. The reversal of 217121570671289 is 982176075121712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214224058596025 + 2897512075264 = 14636395^2 + 1702208^2 .

It is a cyclic number.

It is not a de Polignac number, because 217121570671289 - 2²⁸ = 217121302235833 is a prime.

It is not a weakly prime, because it can be changed into another prime (217121570671283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108560785335644 + 108560785335645.

It is an arithmetic number, because the mean of its divisors is an integer number (108560785335645).

Almost surely, 2^{217121570671289} is an apocalyptic number.

It is an amenable number.

217121570671289 is a deficient number, since it is larger than the sum of its proper divisors (1).

217121570671289 is an equidigital number, since it uses as much as digits as its factorization.

217121570671289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5927040, while the sum is 59.

The spelling of 217121570671289 in words is "two hundred seventeen trillion, one hundred twenty-one billion, five hundred seventy million, six hundred seventy-one thousand, two hundred eighty-nine".