2421431321 has 2 divisors, whose sum is σ = 2421431322. Its totient is φ = 2421431320.

The previous prime is 2421431249. The next prime is 2421431323. The reversal of 2421431321 is 1231341242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2418672400 + 2758921 = 49180^2 + 1661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2421431321 is a prime.

Together with 2421431323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2421431323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210715660 + 1210715661.

It is an arithmetic number, because the mean of its divisors is an integer number (1210715661).

Almost surely, 2^2421431321 is an apocalyptic number.

It is an amenable number.

2421431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421431321 is an equidigital number, since it uses as much as digits as its factorization.

2421431321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 2421431321 is about 49208.0412229546. The cubic root of 2421431321 is about 1342.8393275693.

Adding to 2421431321 its reverse (1231341242), we get a palindrome (3652772563).

The spelling of 2421431321 in words is "two billion, four hundred twenty-one million, four hundred thirty-one thousand, three hundred twenty-one".