123431421 has 8 divisors (see below), whose sum is σ = 164792320. Its totient is φ = 82179072.

The previous prime is 123431401. The next prime is 123431431. The reversal of 123431421 is 124134321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123431421 - 2⁷ = 123431293 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 (123431401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24445 + ... + 29058.

It is an arithmetic number, because the mean of its divisors is an integer number (20599040).

Almost surely, 2^123431421 is an apocalyptic number.

It is an amenable number.

123431421 is a deficient number, since it is larger than the sum of its proper divisors (41360899).

123431421 is an equidigital number, since it uses as much as digits as its factorization.

123431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54275.

The product of its digits is 576, while the sum is 21.

The square root of 123431421 is about 11109.9694419022. The cubic root of 123431421 is about 497.8997515990.

Adding to 123431421 its reverse (124134321), we get a palindrome (247565742).

The spelling of 123431421 in words is "one hundred twenty-three million, four hundred thirty-one thousand, four hundred twenty-one".