211115927917 has 2 divisors, whose sum is σ = 211115927918. Its totient is φ = 211115927916.

The previous prime is 211115927833. The next prime is 211115927929. The reversal of 211115927917 is 719729511112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121392315396 + 89723612521 = 348414^2 + 299539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211115927917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211115921917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105557963958 + 105557963959.

It is an arithmetic number, because the mean of its divisors is an integer number (105557963959).

Almost surely, 2^211115927917 is an apocalyptic number.

It is an amenable number.

211115927917 is a deficient number, since it is larger than the sum of its proper divisors (1).

211115927917 is an equidigital number, since it uses as much as digits as its factorization.

211115927917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 46.

The spelling of 211115927917 in words is "two hundred eleven billion, one hundred fifteen million, nine hundred twenty-seven thousand, nine hundred seventeen".