20011102210091 has 2 divisors, whose sum is σ = 20011102210092. Its totient is φ = 20011102210090.

The previous prime is 20011102210081. The next prime is 20011102210171. The reversal of 20011102210091 is 19001220111002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20011102210091 - 2¹⁰ = 20011102209067 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011102210051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005551105045 + 10005551105046.

It is an arithmetic number, because the mean of its divisors is an integer number (10005551105046).

Almost surely, 2^{20011102210091} is an apocalyptic number.

20011102210091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011102210091 is an equidigital number, since it uses as much as digits as its factorization.

20011102210091 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20011102210091 its reverse (19001220111002), we get a palindrome (39012322321093).

The spelling of 20011102210091 in words is "twenty trillion, eleven billion, one hundred two million, two hundred ten thousand, ninety-one".