211398567917 has 2 divisors, whose sum is σ = 211398567918. Its totient is φ = 211398567916.

The previous prime is 211398567857. The next prime is 211398567983. The reversal of 211398567917 is 719765893112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132051565321 + 79347002596 = 363389^2 + 281686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211398567917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211398567517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105699283958 + 105699283959.

It is an arithmetic number, because the mean of its divisors is an integer number (105699283959).

Almost surely, 2^211398567917 is an apocalyptic number.

It is an amenable number.

211398567917 is a deficient number, since it is larger than the sum of its proper divisors (1).

211398567917 is an equidigital number, since it uses as much as digits as its factorization.

211398567917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 59.

The spelling of 211398567917 in words is "two hundred eleven billion, three hundred ninety-eight million, five hundred sixty-seven thousand, nine hundred seventeen".