20101110091 has 2 divisors, whose sum is σ = 20101110092. Its totient is φ = 20101110090.

The previous prime is 20101110089. The next prime is 20101110101. The reversal of 20101110091 is 19001110102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20101110091 - 2¹ = 20101110089 is a prime.

Together with 20101110089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20101110011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050555045 + 10050555046.

It is an arithmetic number, because the mean of its divisors is an integer number (10050555046).

Almost surely, 2^20101110091 is an apocalyptic number.

20101110091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101110091 is an equidigital number, since it uses as much as digits as its factorization.

20101110091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 20101110091 its reverse (19001110102), we get a palindrome (39102220193).

The spelling of 20101110091 in words is "twenty billion, one hundred one million, one hundred ten thousand, ninety-one".