21222210022217 has 2 divisors, whose sum is σ = 21222210022218. Its totient is φ = 21222210022216.

The previous prime is 21222210022193. The next prime is 21222210022357. The reversal of 21222210022217 is 71222001222212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18049718262016 + 3172491760201 = 4248496^2 + 1781149^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222210022217 - 2¹⁰ = 21222210021193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222210021217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611105011108 + 10611105011109.

It is an arithmetic number, because the mean of its divisors is an integer number (10611105011109).

Almost surely, 2^{21222210022217} is an apocalyptic number.

It is an amenable number.

21222210022217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222210022217 is an equidigital number, since it uses as much as digits as its factorization.

21222210022217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 26.

Adding to 21222210022217 its reverse (71222001222212), we get a palindrome (92444211244429).

The spelling of 21222210022217 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, twenty-two thousand, two hundred seventeen".