20110102109 has 2 divisors, whose sum is σ = 20110102110. Its totient is φ = 20110102108.

The previous prime is 20110102097. The next prime is 20110102127. The reversal of 20110102109 is 90120101102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16090922500 + 4019179609 = 126850^2 + 63397^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110102109 - 2²⁰ = 20109053533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110102139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055051054 + 10055051055.

It is an arithmetic number, because the mean of its divisors is an integer number (10055051055).

Almost surely, 2^20110102109 is an apocalyptic number.

It is an amenable number.

20110102109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110102109 is an equidigital number, since it uses as much as digits as its factorization.

20110102109 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.

The spelling of 20110102109 in words is "twenty billion, one hundred ten million, one hundred two thousand, one hundred nine".