21222001210217 has 2 divisors, whose sum is σ = 21222001210218. Its totient is φ = 21222001210216.

The previous prime is 21222001210199. The next prime is 21222001210219. The reversal of 21222001210217 is 71201210022212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16799661390121 + 4422339820096 = 4098739^2 + 2102936^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222001210217 - 2¹⁶ = 21222001144681 is a prime.

Together with 21222001210219, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222001210192 and 21222001210201.

It is not a weakly prime, because it can be changed into another prime (21222001210219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611000605108 + 10611000605109.

It is an arithmetic number, because the mean of its divisors is an integer number (10611000605109).

Almost surely, 2^{21222001210217} is an apocalyptic number.

It is an amenable number.

21222001210217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222001210217 is an equidigital number, since it uses as much as digits as its factorization.

21222001210217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21222001210217 its reverse (71201210022212), we get a palindrome (92423211232429).

The spelling of 21222001210217 in words is "twenty-one trillion, two hundred twenty-two billion, one million, two hundred ten thousand, two hundred seventeen".