220420356217 has 2 divisors, whose sum is σ = 220420356218. Its totient is φ = 220420356216.

The previous prime is 220420356197. The next prime is 220420356223. The reversal of 220420356217 is 712653024022.

220420356217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179721732096 + 40698624121 = 423936^2 + 201739^2 .

It is a cyclic number.

It is not a de Polignac number, because 220420356217 - 2³¹ = 218272872569 is a prime.

It is not a weakly prime, because it can be changed into another prime (220420356257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110210178108 + 110210178109.

It is an arithmetic number, because the mean of its divisors is an integer number (110210178109).

Almost surely, 2^220420356217 is an apocalyptic number.

It is an amenable number.

220420356217 is a deficient number, since it is larger than the sum of its proper divisors (1).

220420356217 is an equidigital number, since it uses as much as digits as its factorization.

220420356217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 220420356217 in words is "two hundred twenty billion, four hundred twenty million, three hundred fifty-six thousand, two hundred seventeen".