2117985196841 has 2 divisors, whose sum is σ = 2117985196842. Its totient is φ = 2117985196840.

The previous prime is 2117985196819. The next prime is 2117985196909. The reversal of 2117985196841 is 1486915897112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1450569724816 + 667415472025 = 1204396^2 + 816955^2 .

It is a cyclic number.

It is not a de Polignac number, because 2117985196841 - 2¹⁸ = 2117984934697 is a prime.

It is a super-2 number, since 2×2117985196841² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2117985196141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058992598420 + 1058992598421.

It is an arithmetic number, because the mean of its divisors is an integer number (1058992598421).

Almost surely, 2^{2117985196841} is an apocalyptic number.

It is an amenable number.

2117985196841 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117985196841 is an equidigital number, since it uses as much as digits as its factorization.

2117985196841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 62.

The spelling of 2117985196841 in words is "two trillion, one hundred seventeen billion, nine hundred eighty-five million, one hundred ninety-six thousand, eight hundred forty-one".