20021220010217 has 2 divisors, whose sum is σ = 20021220010218. Its totient is φ = 20021220010216.

The previous prime is 20021220010163. The next prime is 20021220010313. The reversal of 20021220010217 is 71201002212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19219140353296 + 802079656921 = 4383964^2 + 895589^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021220010217 - 2¹⁶ = 20021219944681 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021220015217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010610005108 + 10010610005109.

It is an arithmetic number, because the mean of its divisors is an integer number (10010610005109).

Almost surely, 2^{20021220010217} is an apocalyptic number.

It is an amenable number.

20021220010217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021220010217 is an equidigital number, since it uses as much as digits as its factorization.

20021220010217 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 20.

Adding to 20021220010217 its reverse (71201002212002), we get a palindrome (91222222222219).

The spelling of 20021220010217 in words is "twenty trillion, twenty-one billion, two hundred twenty million, ten thousand, two hundred seventeen".