421003443 has 12 divisors (see below), whose sum is σ = 652985160. Its totient is φ = 240573312.

The previous prime is 421003441. The next prime is 421003489. The reversal of 421003443 is 344300124.

It is not a de Polignac number, because 421003443 - 2¹ = 421003441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (421003441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1431838 + ... + 1432131.

It is an arithmetic number, because the mean of its divisors is an integer number (54415430).

Almost surely, 2^421003443 is an apocalyptic number.

421003443 is a deficient number, since it is larger than the sum of its proper divisors (231981717).

421003443 is a wasteful number, since it uses less digits than its factorization.

421003443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863986 (or 2863979 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 421003443 is about 20518.3684292879. The cubic root of 421003443 is about 749.4831657027.

Adding to 421003443 its reverse (344300124), we get a palindrome (765303567).

The spelling of 421003443 in words is "four hundred twenty-one million, three thousand, four hundred forty-three".