1210105205 has 4 divisors (see below), whose sum is σ = 1452126252. Its totient is φ = 968084160.

The previous prime is 1210105199. The next prime is 1210105207. The reversal of 1210105205 is 5025010121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5025010121 = 373 ⋅13471877.

It can be written as a sum of positive squares in 2 ways, for example, as 260047876 + 950057329 = 16126^2 + 30823^2 .

It is not a de Polignac number, because 1210105205 - 2⁴ = 1210105189 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 (1210105207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121010516 + ... + 121010525.

It is an arithmetic number, because the mean of its divisors is an integer number (363031563).

Almost surely, 2^1210105205 is an apocalyptic number.

It is an amenable number.

1210105205 is a deficient number, since it is larger than the sum of its proper divisors (242021047).

1210105205 is an equidigital number, since it uses as much as digits as its factorization.

1210105205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242021046.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1210105205 is about 34786.5664445343. The cubic root of 1210105205 is about 1065.6331192554.

Adding to 1210105205 its reverse (5025010121), we get a palindrome (6235115326).

The spelling of 1210105205 in words is "one billion, two hundred ten million, one hundred five thousand, two hundred five".