123404434421 has 4 divisors (see below), whose sum is σ = 123539895744. Its totient is φ = 123268973100.

The previous prime is 123404434333. The next prime is 123404434441. The reversal of 123404434421 is 124434404321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124434404321 = 20369 ⋅6109009.

It is a cyclic number.

It is not a de Polignac number, because 123404434421 - 2²⁶ = 123337325557 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 (123404434441) 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, 67729295 + ... + 67731116.

It is an arithmetic number, because the mean of its divisors is an integer number (30884973936).

Almost surely, 2^123404434421 is an apocalyptic number.

It is an amenable number.

123404434421 is a deficient number, since it is larger than the sum of its proper divisors (135461323).

123404434421 is an equidigital number, since it uses as much as digits as its factorization.

123404434421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135461322.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 123404434421 its reverse (124434404321), we get a palindrome (247838838742).

The spelling of 123404434421 in words is "one hundred twenty-three billion, four hundred four million, four hundred thirty-four thousand, four hundred twenty-one".