2116211917 has 2 divisors, whose sum is σ = 2116211918. Its totient is φ = 2116211916.

The previous prime is 2116211891. The next prime is 2116211987. The reversal of 2116211917 is 7191126112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1453973161 + 662238756 = 38131^2 + 25734^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116211917 - 2²³ = 2107823309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2116211987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058105958 + 1058105959.

It is an arithmetic number, because the mean of its divisors is an integer number (1058105959).

Almost surely, 2^2116211917 is an apocalyptic number.

It is an amenable number.

2116211917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116211917 is an equidigital number, since it uses as much as digits as its factorization.

2116211917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 31.

The square root of 2116211917 is about 46002.3033879827. The cubic root of 2116211917 is about 1283.8660613856.

The spelling of 2116211917 in words is "two billion, one hundred sixteen million, two hundred eleven thousand, nine hundred seventeen".