211211261116397 has 2 divisors, whose sum is σ = 211211261116398. Its totient is φ = 211211261116396.

The previous prime is 211211261116367. The next prime is 211211261116433. The reversal of 211211261116397 is 793611162112112.

It is a happy number.

211211261116397 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., 211194311940676 + 16949175721 = 14532526^2 + 130189^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211261116397 - 2¹⁶ = 211211261050861 is a prime.

It is a super-2 number, since 2×211211261116397² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211211261116367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605630558198 + 105605630558199.

It is an arithmetic number, because the mean of its divisors is an integer number (105605630558199).

Almost surely, 2^{211211261116397} is an apocalyptic number.

It is an amenable number.

211211261116397 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211261116397 is an equidigital number, since it uses as much as digits as its factorization.

211211261116397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 44.

The spelling of 211211261116397 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred sixty-one million, one hundred sixteen thousand, three hundred ninety-seven".