212221010122217 has 2 divisors, whose sum is σ = 212221010122218. Its totient is φ = 212221010122216.

The previous prime is 212221010122129. The next prime is 212221010122229. The reversal of 212221010122217 is 712221010122212.

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., 199747653170521 + 12473356951696 = 14133211^2 + 3531764^2 .

It is a cyclic number.

It is not a de Polignac number, because 212221010122217 - 2¹⁸ = 212221009860073 is a prime.

It is not a weakly prime, because it can be changed into another prime (212221010121217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110505061108 + 106110505061109.

It is an arithmetic number, because the mean of its divisors is an integer number (106110505061109).

Almost surely, 2^{212221010122217} is an apocalyptic number.

It is an amenable number.

212221010122217 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221010122217 is an equidigital number, since it uses as much as digits as its factorization.

212221010122217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 212221010122217 its reverse (712221010122212), we get a palindrome (924442020244429).

The spelling of 212221010122217 in words is "two hundred twelve trillion, two hundred twenty-one billion, ten million, one hundred twenty-two thousand, two hundred seventeen".