211241685709 has 2 divisors, whose sum is σ = 211241685710. Its totient is φ = 211241685708.

The previous prime is 211241685679. The next prime is 211241685751. The reversal of 211241685709 is 907586142112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196268492484 + 14973193225 = 443022^2 + 122365^2 .

It is a cyclic number.

It is not a de Polignac number, because 211241685709 - 2¹¹ = 211241683661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211241605709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105620842854 + 105620842855.

It is an arithmetic number, because the mean of its divisors is an integer number (105620842855).

Almost surely, 2^211241685709 is an apocalyptic number.

It is an amenable number.

211241685709 is a deficient number, since it is larger than the sum of its proper divisors (1).

211241685709 is an equidigital number, since it uses as much as digits as its factorization.

211241685709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 211241685709 in words is "two hundred eleven billion, two hundred forty-one million, six hundred eighty-five thousand, seven hundred nine".