212320320021217 has 2 divisors, whose sum is σ = 212320320021218. Its totient is φ = 212320320021216.

The previous prime is 212320320021197. The next prime is 212320320021233. The reversal of 212320320021217 is 712120023023212.

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., 212223389916321 + 96930104896 = 14567889^2 + 311336^2 .

It is a cyclic number.

It is not a de Polignac number, because 212320320021217 - 2³⁹ = 211770564207329 is a prime.

It is a super-2 number, since 2×212320320021217² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212320320025217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106160160010608 + 106160160010609.

It is an arithmetic number, because the mean of its divisors is an integer number (106160160010609).

Almost surely, 2^{212320320021217} is an apocalyptic number.

It is an amenable number.

212320320021217 is a deficient number, since it is larger than the sum of its proper divisors (1).

212320320021217 is an equidigital number, since it uses as much as digits as its factorization.

212320320021217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

Adding to 212320320021217 its reverse (712120023023212), we get a palindrome (924440343044429).

The spelling of 212320320021217 in words is "two hundred twelve trillion, three hundred twenty billion, three hundred twenty million, twenty-one thousand, two hundred seventeen".