421433443 has 4 divisors (see below), whose sum is σ = 430400160. Its totient is φ = 412466728.

The previous prime is 421433377. The next prime is 421433447. The reversal of 421433443 is 344334124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421433443 is a prime.

It is a super-2 number, since 2×421433443² = 355212293757668498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421433447) 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, 4483288 + ... + 4483381.

It is an arithmetic number, because the mean of its divisors is an integer number (107600040).

Almost surely, 2^421433443 is an apocalyptic number.

421433443 is a deficient number, since it is larger than the sum of its proper divisors (8966717).

421433443 is an equidigital number, since it uses as much as digits as its factorization.

421433443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8966716.

The product of its digits is 13824, while the sum is 28.

The square root of 421433443 is about 20528.8441710682. The cubic root of 421433443 is about 749.7382452492.

Adding to 421433443 its reverse (344334124), we get a palindrome (765767567).

The spelling of 421433443 in words is "four hundred twenty-one million, four hundred thirty-three thousand, four hundred forty-three".