211397847613 has 2 divisors, whose sum is σ = 211397847614. Its totient is φ = 211397847612.

The previous prime is 211397847611. The next prime is 211397847631. The reversal of 211397847613 is 316748793112.

It is a happy number.

Together with next prime (211397847631) 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., 207036830169 + 4361017444 = 455013^2 + 66038^2 .

It is a cyclic number.

It is not a de Polignac number, because 211397847613 - 2¹ = 211397847611 is a prime.

Together with 211397847611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211397847611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105698923806 + 105698923807.

It is an arithmetic number, because the mean of its divisors is an integer number (105698923807).

Almost surely, 2^211397847613 is an apocalyptic number.

It is an amenable number.

211397847613 is a deficient number, since it is larger than the sum of its proper divisors (1).

211397847613 is an equidigital number, since it uses as much as digits as its factorization.

211397847613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The spelling of 211397847613 in words is "two hundred eleven billion, three hundred ninety-seven million, eight hundred forty-seven thousand, six hundred thirteen".