211986745709 has 2 divisors, whose sum is σ = 211986745710. Its totient is φ = 211986745708.

The previous prime is 211986745703. The next prime is 211986745739. The reversal of 211986745709 is 907547689112.

211986745709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191244409225 + 20742336484 = 437315^2 + 144022^2 .

It is a cyclic number.

It is not a de Polignac number, because 211986745709 - 2¹⁶ = 211986680173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211986745703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105993372854 + 105993372855.

It is an arithmetic number, because the mean of its divisors is an integer number (105993372855).

Almost surely, 2^211986745709 is an apocalyptic number.

It is an amenable number.

211986745709 is a deficient number, since it is larger than the sum of its proper divisors (1).

211986745709 is an equidigital number, since it uses as much as digits as its factorization.

211986745709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 211986745709 in words is "two hundred eleven billion, nine hundred eighty-six million, seven hundred forty-five thousand, seven hundred nine".