421005443 has 4 divisors (see below), whose sum is σ = 421238208. Its totient is φ = 420772680.

The previous prime is 421005427. The next prime is 421005449. The reversal of 421005443 is 344500124.

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 421005443 - 2⁴ = 421005427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421005449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113648 + ... + 117293.

It is an arithmetic number, because the mean of its divisors is an integer number (105309552).

Almost surely, 2^421005443 is an apocalyptic number.

421005443 is a deficient number, since it is larger than the sum of its proper divisors (232765).

421005443 is a wasteful number, since it uses less digits than its factorization.

421005443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232764.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 421005443 is about 20518.4171660487. The cubic root of 421005443 is about 749.4843525211.

Adding to 421005443 its reverse (344500124), we get a palindrome (765505567).

The spelling of 421005443 in words is "four hundred twenty-one million, five thousand, four hundred forty-three".