2012105521 has 4 divisors (see below), whose sum is σ = 2081488500. Its totient is φ = 1942722544.

The previous prime is 2012105509. The next prime is 2012105531. The reversal of 2012105521 is 1255012102.

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 709689600 + 1302415921 = 26640^2 + 36089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012105521 - 2¹⁵ = 2012072753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2012105531) 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, 34691446 + ... + 34691503.

It is an arithmetic number, because the mean of its divisors is an integer number (520372125).

Almost surely, 2^2012105521 is an apocalyptic number.

It is an amenable number.

2012105521 is a deficient number, since it is larger than the sum of its proper divisors (69382979).

2012105521 is an equidigital number, since it uses as much as digits as its factorization.

2012105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69382978.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 2012105521 is about 44856.4992058007. The cubic root of 2012105521 is about 1262.4579384869.

Adding to 2012105521 its reverse (1255012102), we get a palindrome (3267117623).

The spelling of 2012105521 in words is "two billion, twelve million, one hundred five thousand, five hundred twenty-one".