2102321205 has 24 divisors (see below), whose sum is σ = 3645434520. Its totient is φ = 1120803840.

The previous prime is 2102321191. The next prime is 2102321227. The reversal of 2102321205 is 5021232012.

It can be written as a sum of positive squares in 4 ways, for example, as 371178756 + 1731142449 = 19266^2 + 41607^2 .

It is not a de Polignac number, because 2102321205 - 2⁴ = 2102321189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132961 + ... + 147929.

It is an arithmetic number, because the mean of its divisors is an integer number (151893105).

Almost surely, 2^2102321205 is an apocalyptic number.

It is an amenable number.

2102321205 is a deficient number, since it is larger than the sum of its proper divisors (1543113315).

2102321205 is a wasteful number, since it uses less digits than its factorization.

2102321205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18101 (or 18098 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2102321205 is about 45851.0763777689. The cubic root of 2102321205 is about 1281.0508145485.

Adding to 2102321205 its reverse (5021232012), we get a palindrome (7123553217).

The spelling of 2102321205 in words is "two billion, one hundred two million, three hundred twenty-one thousand, two hundred five".