421423444023 has 4 divisors (see below), whose sum is σ = 561897925368. Its totient is φ = 280948962680.

The previous prime is 421423444003. The next prime is 421423444027. The reversal of 421423444023 is 320444324124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421423444023 is a prime.

It is a super-2 number, since 2×421423444023² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421423444027) 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, 70237240668 + ... + 70237240673.

It is an arithmetic number, because the mean of its divisors is an integer number (140474481342).

Almost surely, 2^421423444023 is an apocalyptic number.

421423444023 is a deficient number, since it is larger than the sum of its proper divisors (140474481345).

421423444023 is a wasteful number, since it uses less digits than its factorization.

421423444023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140474481344.

The product of its (nonzero) digits is 73728, while the sum is 33.

Adding to 421423444023 its reverse (320444324124), we get a palindrome (741867768147).

The spelling of 421423444023 in words is "four hundred twenty-one billion, four hundred twenty-three million, four hundred forty-four thousand, twenty-three".