121710217 has 2 divisors, whose sum is σ = 121710218. Its totient is φ = 121710216.

The previous prime is 121710179. The next prime is 121710221. The reversal of 121710217 is 712017121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102839881 + 18870336 = 10141^2 + 4344^2 .

It is an emirp because it is prime and its reverse (712017121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121710217 is a prime.

It is not a weakly prime, because it can be changed into another prime (121714217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60855108 + 60855109.

It is an arithmetic number, because the mean of its divisors is an integer number (60855109).

Almost surely, 2^121710217 is an apocalyptic number.

It is an amenable number.

121710217 is a deficient number, since it is larger than the sum of its proper divisors (1).

121710217 is an equidigital number, since it uses as much as digits as its factorization.

121710217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 22.

The square root of 121710217 is about 11032.2353582581. The cubic root of 121710217 is about 495.5745693533.

Adding to 121710217 its reverse (712017121), we get a palindrome (833727338).

The spelling of 121710217 in words is "one hundred twenty-one million, seven hundred ten thousand, two hundred seventeen".