421444343 has 2 divisors, whose sum is σ = 421444344. Its totient is φ = 421444342.

The previous prime is 421444321. The next prime is 421444351. The reversal of 421444343 is 343444124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421444343 - 2⁶ = 421444279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421444313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210722171 + 210722172.

It is an arithmetic number, because the mean of its divisors is an integer number (210722172).

Almost surely, 2^421444343 is an apocalyptic number.

421444343 is a deficient number, since it is larger than the sum of its proper divisors (1).

421444343 is an equidigital number, since it uses as much as digits as its factorization.

421444343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 29.

The square root of 421444343 is about 20529.1096494709. The cubic root of 421444343 is about 749.7447089637.

Adding to 421444343 its reverse (343444124), we get a palindrome (764888467).

The spelling of 421444343 in words is "four hundred twenty-one million, four hundred forty-four thousand, three hundred forty-three".