421000443 has 8 divisors (see below), whose sum is σ = 623704400. Its totient is φ = 280666944.

The previous prime is 421000439. The next prime is 421000457. The reversal of 421000443 is 344000124.

It is not a de Polignac number, because 421000443 - 2² = 421000439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421000403) 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 in 7 ways as a sum of consecutive naturals, for example, 7796278 + ... + 7796331.

It is an arithmetic number, because the mean of its divisors is an integer number (77963050).

Almost surely, 2^421000443 is an apocalyptic number.

421000443 is a deficient number, since it is larger than the sum of its proper divisors (202703957).

421000443 is a wasteful number, since it uses less digits than its factorization.

421000443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15592618 (or 15592612 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 421000443 is about 20518.2953239298. The cubic root of 421000443 is about 749.4813854679.

Adding to 421000443 its reverse (344000124), we get a palindrome (765000567).

The spelling of 421000443 in words is "four hundred twenty-one million, four hundred forty-three", and thus it is an aban number.