2130121305 has 24 divisors (see below), whose sum is σ = 3976227528. Its totient is φ = 1048674816.

The previous prime is 2130121297. The next prime is 2130121337. The reversal of 2130121305 is 5031210312.

It can be written as a sum of positive squares in 4 ways, for example, as 32114889 + 2098006416 = 5667^2 + 45804^2 .

It is not a de Polignac number, because 2130121305 - 2³ = 2130121297 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 1820032 + ... + 1821201.

It is an arithmetic number, because the mean of its divisors is an integer number (165676147).

Almost surely, 2^2130121305 is an apocalyptic number.

It is an amenable number.

2130121305 is a deficient number, since it is larger than the sum of its proper divisors (1846106223).

2130121305 is a wasteful number, since it uses less digits than its factorization.

2130121305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641257 (or 3641254 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 2130121305 is about 46153.2372104059. The cubic root of 2130121305 is about 1286.6727759366.

Adding to 2130121305 its reverse (5031210312), we get a palindrome (7161331617).

The spelling of 2130121305 in words is "two billion, one hundred thirty million, one hundred twenty-one thousand, three hundred five".