21010220022217 has 2 divisors, whose sum is σ = 21010220022218. Its totient is φ = 21010220022216.

The previous prime is 21010220022199. The next prime is 21010220022221. The reversal of 21010220022217 is 71222002201012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19147879437241 + 1862340584976 = 4375829^2 + 1364676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010220022217 - 2¹⁹ = 21010219497929 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010220022277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505110011108 + 10505110011109.

It is an arithmetic number, because the mean of its divisors is an integer number (10505110011109).

Almost surely, 2^{21010220022217} is an apocalyptic number.

It is an amenable number.

21010220022217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010220022217 is an equidigital number, since it uses as much as digits as its factorization.

21010220022217 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 22.

Adding to 21010220022217 its reverse (71222002201012), we get a palindrome (92232222223229).

The spelling of 21010220022217 in words is "twenty-one trillion, ten billion, two hundred twenty million, twenty-two thousand, two hundred seventeen".