2105100005 has 4 divisors (see below), whose sum is σ = 2526120012. Its totient is φ = 1684080000.

The previous prime is 2105099989. The next prime is 2105100007. The reversal of 2105100005 is 5000015012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1210970401 + 894129604 = 34799^2 + 29902^2 .

It is not a de Polignac number, because 2105100005 - 2⁴ = 2105099989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105100007) 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 in 3 ways as a sum of consecutive naturals, for example, 210509996 + ... + 210510005.

It is an arithmetic number, because the mean of its divisors is an integer number (631530003).

Almost surely, 2^2105100005 is an apocalyptic number.

It is an amenable number.

2105100005 is a deficient number, since it is larger than the sum of its proper divisors (421020007).

2105100005 is an equidigital number, since it uses as much as digits as its factorization.

2105100005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421020006.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 2105100005 is about 45881.3688222137. The cubic root of 2105100005 is about 1281.6149872562.

Adding to 2105100005 its reverse (5000015012), we get a palindrome (7105115017).

The spelling of 2105100005 in words is "two billion, one hundred five million, one hundred thousand, five".