211959361217 has 2 divisors, whose sum is σ = 211959361218. Its totient is φ = 211959361216.

The previous prime is 211959361199. The next prime is 211959361259. The reversal of 211959361217 is 712163959112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208877334961 + 3082026256 = 457031^2 + 55516^2 .

It is a cyclic number.

It is not a de Polignac number, because 211959361217 - 2⁶ = 211959361153 is a prime.

It is not a weakly prime, because it can be changed into another prime (211959361267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105979680608 + 105979680609.

It is an arithmetic number, because the mean of its divisors is an integer number (105979680609).

Almost surely, 2^211959361217 is an apocalyptic number.

It is an amenable number.

211959361217 is a deficient number, since it is larger than the sum of its proper divisors (1).

211959361217 is an equidigital number, since it uses as much as digits as its factorization.

211959361217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 47.

The spelling of 211959361217 in words is "two hundred eleven billion, nine hundred fifty-nine million, three hundred sixty-one thousand, two hundred seventeen".