2020321521 has 20 divisors (see below), whose sum is σ = 3020363764. Its totient is φ = 1345831200.

The previous prime is 2020321519. The next prime is 2020321549. The reversal of 2020321521 is 1251230202.

It can be written as a sum of positive squares in 2 ways, for example, as 1298593296 + 721728225 = 36036^2 + 26865^2 .

It is not a de Polignac number, because 2020321521 - 2¹ = 2020321519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2020321494 and 2020321503.

It is not an unprimeable number, because it can be changed into a prime (2020321921) 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 19 ways as a sum of consecutive naturals, for example, 102831 + ... + 120891.

Almost surely, 2^2020321521 is an apocalyptic number.

It is an amenable number.

2020321521 is a deficient number, since it is larger than the sum of its proper divisors (1000042243).

2020321521 is a wasteful number, since it uses less digits than its factorization.

2020321521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19454 (or 19445 counting only the distinct ones).

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

The square root of 2020321521 is about 44947.9868403469. The cubic root of 2020321521 is about 1264.1739301011.

Adding to 2020321521 its reverse (1251230202), we get a palindrome (3271551723).

The spelling of 2020321521 in words is "two billion, twenty million, three hundred twenty-one thousand, five hundred twenty-one".