212216371124861 has 2 divisors, whose sum is σ = 212216371124862. Its totient is φ = 212216371124860.

The previous prime is 212216371124773. The next prime is 212216371124867. The reversal of 212216371124861 is 168421173612212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212206404097636 + 9967027225 = 14567306^2 + 99835^2 .

It is a cyclic number.

It is not a de Polignac number, because 212216371124861 - 2¹⁴ = 212216371108477 is a prime.

It is a super-2 number, since 2×212216371124861² (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 (212216371124867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106108185562430 + 106108185562431.

It is an arithmetic number, because the mean of its divisors is an integer number (106108185562431).

Almost surely, 2^{212216371124861} is an apocalyptic number.

It is an amenable number.

212216371124861 is a deficient number, since it is larger than the sum of its proper divisors (1).

212216371124861 is an equidigital number, since it uses as much as digits as its factorization.

212216371124861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The spelling of 212216371124861 in words is "two hundred twelve trillion, two hundred sixteen billion, three hundred seventy-one million, one hundred twenty-four thousand, eight hundred sixty-one".