421643323 has 4 divisors (see below), whose sum is σ = 428789880. Its totient is φ = 414496768.

The previous prime is 421643309. The next prime is 421643353. The reversal of 421643323 is 323346124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421643323 - 2¹³ = 421635131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421643291 and 421643300.

It is not an unprimeable number, because it can be changed into a prime (421643353) 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 in 3 ways as a sum of consecutive naturals, for example, 3573190 + ... + 3573307.

It is an arithmetic number, because the mean of its divisors is an integer number (107197470).

Almost surely, 2^421643323 is an apocalyptic number.

421643323 is a deficient number, since it is larger than the sum of its proper divisors (7146557).

421643323 is an equidigital number, since it uses as much as digits as its factorization.

421643323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146556.

The product of its digits is 10368, while the sum is 28.

The square root of 421643323 is about 20533.9553666604. The cubic root of 421643323 is about 749.8626847868.

Adding to 421643323 its reverse (323346124), we get a palindrome (744989447).

The spelling of 421643323 in words is "four hundred twenty-one million, six hundred forty-three thousand, three hundred twenty-three".