20102111189 has 2 divisors, whose sum is σ = 20102111190. Its totient is φ = 20102111188.

The previous prime is 20102111129. The next prime is 20102111257. The reversal of 20102111189 is 98111120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11873807089 + 8228304100 = 108967^2 + 90710^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102111189 - 2²⁰ = 20101062613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102111129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051055594 + 10051055595.

It is an arithmetic number, because the mean of its divisors is an integer number (10051055595).

Almost surely, 2^20102111189 is an apocalyptic number.

It is an amenable number.

20102111189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102111189 is an equidigital number, since it uses as much as digits as its factorization.

20102111189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 20102111189 in words is "twenty billion, one hundred two million, one hundred eleven thousand, one hundred eighty-nine".