2191110217 has 2 divisors, whose sum is σ = 2191110218. Its totient is φ = 2191110216.

The previous prime is 2191110211. The next prime is 2191110247. The reversal of 2191110217 is 7120111912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2170534921 + 20575296 = 46589^2 + 4536^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191110217 - 2³ = 2191110209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2191110191 and 2191110200.

It is not a weakly prime, because it can be changed into another prime (2191110211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095555108 + 1095555109.

It is an arithmetic number, because the mean of its divisors is an integer number (1095555109).

Almost surely, 2^2191110217 is an apocalyptic number.

It is an amenable number.

2191110217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191110217 is an equidigital number, since it uses as much as digits as its factorization.

2191110217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 25.

The square root of 2191110217 is about 46809.2962668742. The cubic root of 2191110217 is about 1298.8372674514.

The spelling of 2191110217 in words is "two billion, one hundred ninety-one million, one hundred ten thousand, two hundred seventeen".