2116211891 has 2 divisors, whose sum is σ = 2116211892. Its totient is φ = 2116211890.

The previous prime is 2116211861. The next prime is 2116211917. The reversal of 2116211891 is 1981126112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2116211891 - 2⁶ = 2116211827 is a prime.

It is not a weakly prime, because it can be changed into another prime (2116211861) 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, 1058105945 + 1058105946.

It is an arithmetic number, because the mean of its divisors is an integer number (1058105946).

Almost surely, 2^2116211891 is an apocalyptic number.

2116211891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116211891 is an equidigital number, since it uses as much as digits as its factorization.

2116211891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 32.

The square root of 2116211891 is about 46002.3031053881. The cubic root of 2116211891 is about 1283.8660561277.

The spelling of 2116211891 in words is "two billion, one hundred sixteen million, two hundred eleven thousand, eight hundred ninety-one".