20201201110091 has 2 divisors, whose sum is σ = 20201201110092. Its totient is φ = 20201201110090.

The previous prime is 20201201110073. The next prime is 20201201110109. The reversal of 20201201110091 is 19001110210202.

Together with next prime (20201201110109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (20201201110073) and next prime (20201201110109).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201201110091 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20201201110991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100600555045 + 10100600555046.

It is an arithmetic number, because the mean of its divisors is an integer number (10100600555046).

Almost surely, 2^{20201201110091} is an apocalyptic number.

20201201110091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201201110091 is an equidigital number, since it uses as much as digits as its factorization.

20201201110091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 20201201110091 its reverse (19001110210202), we get a palindrome (39202311320293).

The spelling of 20201201110091 in words is "twenty trillion, two hundred one billion, two hundred one million, one hundred ten thousand, ninety-one".