211399818697 has 2 divisors, whose sum is σ = 211399818698. Its totient is φ = 211399818696.

The previous prime is 211399818683. The next prime is 211399818703. The reversal of 211399818697 is 796818993112.

211399818697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203959721161 + 7440097536 = 451619^2 + 86256^2 .

It is a cyclic number.

It is not a de Polignac number, because 211399818697 - 2¹⁵ = 211399785929 is a prime.

It is not a weakly prime, because it can be changed into another prime (211399818197) 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, 105699909348 + 105699909349.

It is an arithmetic number, because the mean of its divisors is an integer number (105699909349).

Almost surely, 2^211399818697 is an apocalyptic number.

It is an amenable number.

211399818697 is a deficient number, since it is larger than the sum of its proper divisors (1).

211399818697 is an equidigital number, since it uses as much as digits as its factorization.

211399818697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 64.

The spelling of 211399818697 in words is "two hundred eleven billion, three hundred ninety-nine million, eight hundred eighteen thousand, six hundred ninety-seven".