121212317 has 2 divisors, whose sum is σ = 121212318. Its totient is φ = 121212316.

The previous prime is 121212281. The next prime is 121212341. The reversal of 121212317 is 713212121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119880601 + 1331716 = 10949^2 + 1154^2 .

It is a cyclic number.

It is not a de Polignac number, because 121212317 - 2⁶ = 121212253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121212347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606158 + 60606159.

It is an arithmetic number, because the mean of its divisors is an integer number (60606159).

Almost surely, 2^121212317 is an apocalyptic number.

It is an amenable number.

121212317 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212317 is an equidigital number, since it uses as much as digits as its factorization.

121212317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 20.

The square root of 121212317 is about 11009.6465429186. The cubic root of 121212317 is about 494.8978696209.

Adding to 121212317 its reverse (713212121), we get a palindrome (834424438).

The spelling of 121212317 in words is "one hundred twenty-one million, two hundred twelve thousand, three hundred seventeen".