2161171211 has 2 divisors, whose sum is σ = 2161171212. Its totient is φ = 2161171210.

The previous prime is 2161171193. The next prime is 2161171219. The reversal of 2161171211 is 1121711612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161171211 is a prime.

It is a super-2 number, since 2×2161171211² = 9341322006510413042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2161171219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080585605 + 1080585606.

It is an arithmetic number, because the mean of its divisors is an integer number (1080585606).

Almost surely, 2^2161171211 is an apocalyptic number.

2161171211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161171211 is an equidigital number, since it uses as much as digits as its factorization.

2161171211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 23.

The square root of 2161171211 is about 46488.3986710663. The cubic root of 2161171211 is about 1292.8944104708.

Adding to 2161171211 its reverse (1121711612), we get a palindrome (3282882823).

The spelling of 2161171211 in words is "two billion, one hundred sixty-one million, one hundred seventy-one thousand, two hundred eleven".