217876722105389 has 2 divisors, whose sum is σ = 217876722105390. Its totient is φ = 217876722105388.

The previous prime is 217876722105313. The next prime is 217876722105403. The reversal of 217876722105389 is 983501227678712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146723363895364 + 71153358210025 = 12112942^2 + 8435245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217876722105389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217876722107389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108938361052694 + 108938361052695.

It is an arithmetic number, because the mean of its divisors is an integer number (108938361052695).

Almost surely, 2^{217876722105389} is an apocalyptic number.

It is an amenable number.

217876722105389 is a deficient number, since it is larger than the sum of its proper divisors (1).

217876722105389 is an equidigital number, since it uses as much as digits as its factorization.

217876722105389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142248960, while the sum is 68.

The spelling of 217876722105389 in words is "two hundred seventeen trillion, eight hundred seventy-six billion, seven hundred twenty-two million, one hundred five thousand, three hundred eighty-nine".