421123042423 has 4 divisors (see below), whose sum is σ = 421146064120. Its totient is φ = 421100020728.

The previous prime is 421123042399. The next prime is 421123042427. The reversal of 421123042423 is 324240321124.

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 421123042423 - 2³⁷ = 283684088951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421123042391 and 421123042400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421123042427) 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, 11483388 + ... + 11520001.

It is an arithmetic number, because the mean of its divisors is an integer number (105286516030).

Almost surely, 2^421123042423 is an apocalyptic number.

421123042423 is a deficient number, since it is larger than the sum of its proper divisors (23021697).

421123042423 is a wasteful number, since it uses less digits than its factorization.

421123042423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23021696.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 421123042423 its reverse (324240321124), we get a palindrome (745363363547).

The spelling of 421123042423 in words is "four hundred twenty-one billion, one hundred twenty-three million, forty-two thousand, four hundred twenty-three".