2105127109 has 2 divisors, whose sum is σ = 2105127110. Its totient is φ = 2105127108.

The previous prime is 2105127107. The next prime is 2105127113. The reversal of 2105127109 is 9017215012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1795894884 + 309232225 = 42378^2 + 17585^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105127109 - 2¹ = 2105127107 is a prime.

Together with 2105127107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105127107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052563554 + 1052563555.

It is an arithmetic number, because the mean of its divisors is an integer number (1052563555).

Almost surely, 2^2105127109 is an apocalyptic number.

It is an amenable number.

2105127109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105127109 is an equidigital number, since it uses as much as digits as its factorization.

2105127109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 2105127109 is about 45881.6641917008. The cubic root of 2105127109 is about 1281.6204876669.

The spelling of 2105127109 in words is "two billion, one hundred five million, one hundred twenty-seven thousand, one hundred nine".