211243240097 has 2 divisors, whose sum is σ = 211243240098. Its totient is φ = 211243240096.

The previous prime is 211243240079. The next prime is 211243240177. The reversal of 211243240097 is 790042342112.

Together with previous prime (211243240079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211231240801 + 11999296 = 459599^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 211243240097 - 2⁸ = 211243239841 is a prime.

It is not a weakly prime, because it can be changed into another prime (211243240007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105621620048 + 105621620049.

It is an arithmetic number, because the mean of its divisors is an integer number (105621620049).

Almost surely, 2^211243240097 is an apocalyptic number.

It is an amenable number.

211243240097 is a deficient number, since it is larger than the sum of its proper divisors (1).

211243240097 is an equidigital number, since it uses as much as digits as its factorization.

211243240097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 211243240097 in words is "two hundred eleven billion, two hundred forty-three million, two hundred forty thousand, ninety-seven".