220512217 has 2 divisors, whose sum is σ = 220512218. Its totient is φ = 220512216.

The previous prime is 220512211. The next prime is 220512283. The reversal of 220512217 is 712215022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149548441 + 70963776 = 12229^2 + 8424^2 .

It is a cyclic number.

It is not a de Polignac number, because 220512217 - 2²³ = 212123609 is a prime.

It is not a weakly prime, because it can be changed into another prime (220512211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110256108 + 110256109.

It is an arithmetic number, because the mean of its divisors is an integer number (110256109).

Almost surely, 2^220512217 is an apocalyptic number.

It is an amenable number.

220512217 is a deficient number, since it is larger than the sum of its proper divisors (1).

220512217 is an equidigital number, since it uses as much as digits as its factorization.

220512217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 220512217 is about 14849.6537670075. The cubic root of 220512217 is about 604.1492191954.

Adding to 220512217 its reverse (712215022), we get a palindrome (932727239).

The spelling of 220512217 in words is "two hundred twenty million, five hundred twelve thousand, two hundred seventeen".