20102111122109 has 2 divisors, whose sum is σ = 20102111122110. Its totient is φ = 20102111122108.

The previous prime is 20102111122099. The next prime is 20102111122133. The reversal of 20102111122109 is 90122111120102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16584873437209 + 3517237684900 = 4072453^2 + 1875430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102111122109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102111122199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051055561054 + 10051055561055.

It is an arithmetic number, because the mean of its divisors is an integer number (10051055561055).

Almost surely, 2^{20102111122109} is an apocalyptic number.

It is an amenable number.

20102111122109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102111122109 is an equidigital number, since it uses as much as digits as its factorization.

20102111122109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 20102111122109 in words is "twenty trillion, one hundred two billion, one hundred eleven million, one hundred twenty-two thousand, one hundred nine".