2130321521 has 4 divisors (see below), whose sum is σ = 2131514100. Its totient is φ = 2129128944.

The previous prime is 2130321511. The next prime is 2130321547. The reversal of 2130321521 is 1251230312.

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 851472400 + 1278849121 = 29180^2 + 35761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130321521 - 2³⁰ = 1056579697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2130321493 and 2130321502.

It is not an unprimeable number, because it can be changed into a prime (2130321511) 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 3 ways as a sum of consecutive naturals, for example, 593606 + ... + 597183.

It is an arithmetic number, because the mean of its divisors is an integer number (532878525).

Almost surely, 2^2130321521 is an apocalyptic number.

It is an amenable number.

2130321521 is a deficient number, since it is larger than the sum of its proper divisors (1192579).

2130321521 is a wasteful number, since it uses less digits than its factorization.

2130321521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192578.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2130321521 is about 46155.4061947244. The cubic root of 2130321521 is about 1286.7130873194.

Adding to 2130321521 its reverse (1251230312), we get a palindrome (3381551833).

It can be divided in two parts, 21303 and 21521, that added together give a palindrome (42824).

The spelling of 2130321521 in words is "two billion, one hundred thirty million, three hundred twenty-one thousand, five hundred twenty-one".