212011220128217 has 2 divisors, whose sum is σ = 212011220128218. Its totient is φ = 212011220128216.

The previous prime is 212011220128199. The next prime is 212011220128231. The reversal of 212011220128217 is 712821022110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140954142952921 + 71057077175296 = 11872411^2 + 8429536^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011220128217 - 2¹⁰ = 212011220127193 is a prime.

It is not a weakly prime, because it can be changed into another prime (212011220122217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005610064108 + 106005610064109.

It is an arithmetic number, because the mean of its divisors is an integer number (106005610064109).

Almost surely, 2^{212011220128217} is an apocalyptic number.

It is an amenable number.

212011220128217 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011220128217 is an equidigital number, since it uses as much as digits as its factorization.

212011220128217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 32.

Adding to 212011220128217 its reverse (712821022110212), we get a palindrome (924832242238429).

The spelling of 212011220128217 in words is "two hundred twelve trillion, eleven billion, two hundred twenty million, one hundred twenty-eight thousand, two hundred seventeen".