2143232321 has 4 divisors (see below), whose sum is σ = 2143330644. Its totient is φ = 2143134000.

The previous prime is 2143232309. The next prime is 2143232323. The reversal of 2143232321 is 1232323412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1744231696 + 399000625 = 41764^2 + 19975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143232321 - 2¹⁸ = 2142970177 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143232323) 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, 230 + ... + 65471.

It is an arithmetic number, because the mean of its divisors is an integer number (535832661).

Almost surely, 2^2143232321 is an apocalyptic number.

It is an amenable number.

2143232321 is a deficient number, since it is larger than the sum of its proper divisors (98323).

2143232321 is an equidigital number, since it uses as much as digits as its factorization.

2143232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98322.

The product of its digits is 1728, while the sum is 23.

The square root of 2143232321 is about 46295.0571983662. The cubic root of 2143232321 is about 1289.3072259240.

Adding to 2143232321 its reverse (1232323412), we get a palindrome (3375555733).

The spelling of 2143232321 in words is "two billion, one hundred forty-three million, two hundred thirty-two thousand, three hundred twenty-one".