212100201021217 has 2 divisors, whose sum is σ = 212100201021218. Its totient is φ = 212100201021216.

The previous prime is 212100201021211. The next prime is 212100201021229. The reversal of 212100201021217 is 712120102001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176168520576801 + 35931680444416 = 13272849^2 + 5994304^2 .

It is a cyclic number.

It is not a de Polignac number, because 212100201021217 - 2³¹ = 212098053537569 is a prime.

It is a super-2 number, since 2×212100201021217² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212100201021211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050100510608 + 106050100510609.

It is an arithmetic number, because the mean of its divisors is an integer number (106050100510609).

Almost surely, 2^{212100201021217} is an apocalyptic number.

It is an amenable number.

212100201021217 is a deficient number, since it is larger than the sum of its proper divisors (1).

212100201021217 is an equidigital number, since it uses as much as digits as its factorization.

212100201021217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 212100201021217 its reverse (712120102001212), we get a palindrome (924220303022429).

The spelling of 212100201021217 in words is "two hundred twelve trillion, one hundred billion, two hundred one million, twenty-one thousand, two hundred seventeen".