421340323 has 2 divisors, whose sum is σ = 421340324. Its totient is φ = 421340322.

The previous prime is 421340321. The next prime is 421340327. The reversal of 421340323 is 323043124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421340323 - 2¹ = 421340321 is a prime.

Together with 421340321, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 421340294 and 421340303.

It is not a weakly prime, because it can be changed into another prime (421340321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210670161 + 210670162.

It is an arithmetic number, because the mean of its divisors is an integer number (210670162).

Almost surely, 2^421340323 is an apocalyptic number.

421340323 is a deficient number, since it is larger than the sum of its proper divisors (1).

421340323 is an equidigital number, since it uses as much as digits as its factorization.

421340323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 421340323 is about 20526.5760174463. The cubic root of 421340323 is about 749.6830204212.

Adding to 421340323 its reverse (323043124), we get a palindrome (744383447).

The spelling of 421340323 in words is "four hundred twenty-one million, three hundred forty thousand, three hundred twenty-three".