20311210109 has 2 divisors, whose sum is σ = 20311210110. Its totient is φ = 20311210108.

The previous prime is 20311210099. The next prime is 20311210111. The reversal of 20311210109 is 90101211302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10386667225 + 9924542884 = 101915^2 + 99622^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311210109 - 2²⁰ = 20310161533 is a prime.

Together with 20311210111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311210169) 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, 10155605054 + 10155605055.

It is an arithmetic number, because the mean of its divisors is an integer number (10155605055).

Almost surely, 2^20311210109 is an apocalyptic number.

It is an amenable number.

20311210109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311210109 is an equidigital number, since it uses as much as digits as its factorization.

20311210109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 20311210109 in words is "twenty billion, three hundred eleven million, two hundred ten thousand, one hundred nine".