215112217 has 2 divisors, whose sum is σ = 215112218. Its totient is φ = 215112216.

The previous prime is 215112211. The next prime is 215112223. The reversal of 215112217 is 712211512.

It is a balanced prime because it is at equal distance from previous prime (215112211) and next prime (215112223).

It can be written as a sum of positive squares in only one way, i.e., 184851216 + 30261001 = 13596^2 + 5501^2 .

It is a cyclic number.

It is not a de Polignac number, because 215112217 - 2¹¹ = 215110169 is a prime.

It is not a weakly prime, because it can be changed into another prime (215112211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107556108 + 107556109.

It is an arithmetic number, because the mean of its divisors is an integer number (107556109).

Almost surely, 2^215112217 is an apocalyptic number.

It is an amenable number.

215112217 is a deficient number, since it is larger than the sum of its proper divisors (1).

215112217 is an equidigital number, since it uses as much as digits as its factorization.

215112217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280, while the sum is 22.

The square root of 215112217 is about 14666.7043673758. The cubic root of 215112217 is about 599.1768499267.

Adding to 215112217 its reverse (712211512), we get a palindrome (927323729).

The spelling of 215112217 in words is "two hundred fifteen million, one hundred twelve thousand, two hundred seventeen".