216051217 has 2 divisors, whose sum is σ = 216051218. Its totient is φ = 216051216.

The previous prime is 216051197. The next prime is 216051229. The reversal of 216051217 is 712150612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159365376 + 56685841 = 12624^2 + 7529^2 .

It is a cyclic number.

It is not a de Polignac number, because 216051217 - 2⁷ = 216051089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216051191 and 216051200.

It is not a weakly prime, because it can be changed into another prime (216051287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108025608 + 108025609.

It is an arithmetic number, because the mean of its divisors is an integer number (108025609).

Almost surely, 2^216051217 is an apocalyptic number.

It is an amenable number.

216051217 is a deficient number, since it is larger than the sum of its proper divisors (1).

216051217 is an equidigital number, since it uses as much as digits as its factorization.

216051217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 216051217 is about 14698.6807911459. The cubic root of 216051217 is about 600.0474194004.

It can be divided in two parts, 21605 and 1217, that added together give a palindrome (22822).

The spelling of 216051217 in words is "two hundred sixteen million, fifty-one thousand, two hundred seventeen".