102012217 has 2 divisors, whose sum is σ = 102012218. Its totient is φ = 102012216.

The previous prime is 102012187. The next prime is 102012221. The reversal of 102012217 is 712210201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75272976 + 26739241 = 8676^2 + 5171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102012217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102012217.

It is not a weakly prime, because it can be changed into another prime (102012247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51006108 + 51006109.

It is an arithmetic number, because the mean of its divisors is an integer number (51006109).

Almost surely, 2^102012217 is an apocalyptic number.

It is an amenable number.

102012217 is a deficient number, since it is larger than the sum of its proper divisors (1).

102012217 is an equidigital number, since it uses as much as digits as its factorization.

102012217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 102012217 is about 10100.1097518789. The cubic root of 102012217 is about 467.2515262869.

Adding to 102012217 its reverse (712210201), we get a palindrome (814222418).

The spelling of 102012217 in words is "one hundred two million, twelve thousand, two hundred seventeen".