20210010001091 has 2 divisors, whose sum is σ = 20210010001092. Its totient is φ = 20210010001090.

The previous prime is 20210010001079. The next prime is 20210010001109. The reversal of 20210010001091 is 19010001001202.

Together with next prime (20210010001109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20210010001091 - 2³⁸ = 19935132094147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210010001031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105005000545 + 10105005000546.

It is an arithmetic number, because the mean of its divisors is an integer number (10105005000546).

Almost surely, 2^{20210010001091} is an apocalyptic number.

20210010001091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210010001091 is an equidigital number, since it uses as much as digits as its factorization.

20210010001091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 20210010001091 its reverse (19010001001202), we get a palindrome (39220011002293).

The spelling of 20210010001091 in words is "twenty trillion, two hundred ten billion, ten million, one thousand, ninety-one".