216713202312181 has 2 divisors, whose sum is σ = 216713202312182. Its totient is φ = 216713202312180.

The previous prime is 216713202312137. The next prime is 216713202312199. The reversal of 216713202312181 is 181213202317612.

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., 206316021327025 + 10397180985156 = 14363705^2 + 3224466^2 .

It is a cyclic number.

It is not a de Polignac number, because 216713202312181 - 2¹⁷ = 216713202181109 is a prime.

It is a super-2 number, since 2×216713202312181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216713202312781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108356601156090 + 108356601156091.

It is an arithmetic number, because the mean of its divisors is an integer number (108356601156091).

Almost surely, 2^{216713202312181} is an apocalyptic number.

It is an amenable number.

216713202312181 is a deficient number, since it is larger than the sum of its proper divisors (1).

216713202312181 is an equidigital number, since it uses as much as digits as its factorization.

216713202312181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

Adding to 216713202312181 its reverse (181213202317612), we get a palindrome (397926404629793).

The spelling of 216713202312181 in words is "two hundred sixteen trillion, seven hundred thirteen billion, two hundred two million, three hundred twelve thousand, one hundred eighty-one".