2002130321 has 4 divisors (see below), whose sum is σ = 2003192100. Its totient is φ = 2001068544.

The previous prime is 2002130303. The next prime is 2002130323. The reversal of 2002130321 is 1230312002.

It is a happy number.

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 1440961600 + 561168721 = 37960^2 + 23689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2002130321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2002130296 and 2002130305.

It is not an unprimeable number, because it can be changed into a prime (2002130323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528056 + ... + 531833.

It is an arithmetic number, because the mean of its divisors is an integer number (500798025).

Almost surely, 2^2002130321 is an apocalyptic number.

It is an amenable number.

2002130321 is a deficient number, since it is larger than the sum of its proper divisors (1061779).

2002130321 is a wasteful number, since it uses less digits than its factorization.

2002130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061778.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2002130321 is about 44745.1709237991. The cubic root of 2002130321 is about 1260.3682305379.

Adding to 2002130321 its reverse (1230312002), we get a palindrome (3232442323).

The spelling of 2002130321 in words is "two billion, two million, one hundred thirty thousand, three hundred twenty-one".