2120521005 has 16 divisors (see below), whose sum is σ = 3769815360. Its totient is φ = 1130944464.

The previous prime is 2120521001. The next prime is 2120521019. The reversal of 2120521005 is 5001250212.

It is not a de Polignac number, because 2120521005 - 2² = 2120521001 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120521001) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7853647 + ... + 7853916.

It is an arithmetic number, because the mean of its divisors is an integer number (235613460).

Almost surely, 2^2120521005 is an apocalyptic number.

It is an amenable number.

2120521005 is a deficient number, since it is larger than the sum of its proper divisors (1649294355).

2120521005 is a wasteful number, since it uses less digits than its factorization.

2120521005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15707577 (or 15707571 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2120521005 is about 46049.1151380784. The cubic root of 2120521005 is about 1284.7368848659.

Adding to 2120521005 its reverse (5001250212), we get a palindrome (7121771217).

The spelling of 2120521005 in words is "two billion, one hundred twenty million, five hundred twenty-one thousand, five".