212013123317 has 2 divisors, whose sum is σ = 212013123318.
Its totient is φ = 212013123316.
The previous prime is 212013123239. The next prime is 212013123319. The reversal of 212013123317 is 713321310212.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 136194950116 + 75818173201 = 369046^2 + 275351^2
It is a cyclic number.
It is not a de Polignac number, because 212013123317 - 220 = 212012074741 is a prime.
Together with 212013123319, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (212013123319) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006561658 + 106006561659.
It is an arithmetic number, because the mean of its divisors is an integer number (106006561659).
Almost surely, 2212013123317 is an apocalyptic number.
It is an amenable number.
212013123317 is a deficient number, since it is larger than the sum of its proper divisors (1).
212013123317 is an equidigital number, since it uses as much as digits as its factorization.
212013123317 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 1512, while the sum is 26.
Adding to 212013123317 its reverse (713321310212), we get a palindrome (925334433529).
The spelling of 212013123317 in words is "two hundred twelve billion, thirteen million, one hundred twenty-three thousand, three hundred seventeen".