421005143 has 4 divisors (see below), whose sum is σ = 453390168. Its totient is φ = 388620120.

The previous prime is 421005139. The next prime is 421005161. The reversal of 421005143 is 341500124.

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 421005143 - 2² = 421005139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421005043) 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, 16192493 + ... + 16192518.

It is an arithmetic number, because the mean of its divisors is an integer number (113347542).

Almost surely, 2^421005143 is an apocalyptic number.

421005143 is a deficient number, since it is larger than the sum of its proper divisors (32385025).

421005143 is a wasteful number, since it uses less digits than its factorization.

421005143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32385024.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 421005143 is about 20518.4098555419. The cubic root of 421005143 is about 749.4841744986.

Adding to 421005143 its reverse (341500124), we get a palindrome (762505267).

The spelling of 421005143 in words is "four hundred twenty-one million, five thousand, one hundred forty-three".