212239717 has 2 divisors, whose sum is σ = 212239718. Its totient is φ = 212239716.

The previous prime is 212239693. The next prime is 212239721. The reversal of 212239717 is 717932212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170067681 + 42172036 = 13041^2 + 6494^2 .

It is a cyclic number.

It is not a de Polignac number, because 212239717 - 2¹⁹ = 211715429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212239817) 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, 106119858 + 106119859.

It is an arithmetic number, because the mean of its divisors is an integer number (106119859).

Almost surely, 2^212239717 is an apocalyptic number.

It is an amenable number.

212239717 is a deficient number, since it is larger than the sum of its proper divisors (1).

212239717 is an equidigital number, since it uses as much as digits as its factorization.

212239717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 212239717 is about 14568.4493684125. The cubic root of 212239717 is about 596.4978545490.

The spelling of 212239717 in words is "two hundred twelve million, two hundred thirty-nine thousand, seven hundred seventeen".