21130110191 has 2 divisors, whose sum is σ = 21130110192. Its totient is φ = 21130110190.

The previous prime is 21130110187. The next prime is 21130110233. The reversal of 21130110191 is 19101103112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21130110191 - 2² = 21130110187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130110161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565055095 + 10565055096.

It is an arithmetic number, because the mean of its divisors is an integer number (10565055096).

Almost surely, 2^21130110191 is an apocalyptic number.

21130110191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130110191 is an equidigital number, since it uses as much as digits as its factorization.

21130110191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 20.

The spelling of 21130110191 in words is "twenty-one billion, one hundred thirty million, one hundred ten thousand, one hundred ninety-one".