20010108091 has 2 divisors, whose sum is σ = 20010108092. Its totient is φ = 20010108090.

The previous prime is 20010108061. The next prime is 20010108133. The reversal of 20010108091 is 19080101002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20010108091 - 2²³ = 20001719483 is a prime.

It is not a weakly prime, because it can be changed into another prime (20010108011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005054045 + 10005054046.

It is an arithmetic number, because the mean of its divisors is an integer number (10005054046).

Almost surely, 2^20010108091 is an apocalyptic number.

20010108091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010108091 is an equidigital number, since it uses as much as digits as its factorization.

20010108091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 20010108091 its reverse (19080101002), we get a palindrome (39090209093).

The spelling of 20010108091 in words is "twenty billion, ten million, one hundred eight thousand, ninety-one".