421040123 has 4 divisors (see below), whose sum is σ = 481188720. Its totient is φ = 360891528.

The previous prime is 421040089. The next prime is 421040141. The reversal of 421040123 is 321040124.

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 421040123 - 2²⁰ = 419991547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421040143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30074288 + ... + 30074301.

It is an arithmetic number, because the mean of its divisors is an integer number (120297180).

Almost surely, 2^421040123 is an apocalyptic number.

421040123 is a deficient number, since it is larger than the sum of its proper divisors (60148597).

421040123 is an equidigital number, since it uses as much as digits as its factorization.

421040123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60148596.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 421040123 is about 20519.2622430730. The cubic root of 421040123 is about 749.5049313554.

Adding to 421040123 its reverse (321040124), we get a palindrome (742080247).

Subtracting from 421040123 its reverse (321040124), we obtain a palindrome (99999999).

The spelling of 421040123 in words is "four hundred twenty-one million, forty thousand, one hundred twenty-three".