2105264905 has 4 divisors (see below), whose sum is σ = 2526317892. Its totient is φ = 1684211920.

The previous prime is 2105264897. The next prime is 2105264929. The reversal of 2105264905 is 5094625012.

It is a happy number.

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 982947904 + 1122317001 = 31352^2 + 33501^2 .

It is not a de Polignac number, because 2105264905 - 2³ = 2105264897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 210526486 + ... + 210526495.

It is an arithmetic number, because the mean of its divisors is an integer number (631579473).

Almost surely, 2^2105264905 is an apocalyptic number.

It is an amenable number.

2105264905 is a deficient number, since it is larger than the sum of its proper divisors (421052987).

2105264905 is an equidigital number, since it uses as much as digits as its factorization.

2105264905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421052986.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 2105264905 is about 45883.1658127466. The cubic root of 2105264905 is about 1281.6484508752.

Adding to 2105264905 its reverse (5094625012), we get a palindrome (7199889917).

The spelling of 2105264905 in words is "two billion, one hundred five million, two hundred sixty-four thousand, nine hundred five".