421040423 has 4 divisors (see below), whose sum is σ = 421213560. Its totient is φ = 420867288.

The previous prime is 421040407. The next prime is 421040441. The reversal of 421040423 is 324040124.

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 421040423 - 2⁴ = 421040407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421040395 and 421040404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421040443) 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, 82868 + ... + 87801.

It is an arithmetic number, because the mean of its divisors is an integer number (105303390).

Almost surely, 2^421040423 is an apocalyptic number.

421040423 is a deficient number, since it is larger than the sum of its proper divisors (173137).

421040423 is a wasteful number, since it uses less digits than its factorization.

421040423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173136.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421040423 is about 20519.2695532760. The cubic root of 421040423 is about 749.5051093680.

Adding to 421040423 its reverse (324040124), we get a palindrome (745080547).

The spelling of 421040423 in words is "four hundred twenty-one million, forty thousand, four hundred twenty-three".