123421431 has 8 divisors (see below), whose sum is σ = 188070784. Its totient is φ = 70526520.

The previous prime is 123421421. The next prime is 123421453. The reversal of 123421431 is 134124321.

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

It is not a de Polignac number, because 123421431 - 2⁵ = 123421399 is a prime.

It is a super-2 number, since 2×123421431² = 30465699260175522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 5877211 = 123421431 / (1 + 2 + 3 + 4 + 2 + 1 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123421398 and 123421407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123421421) 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 7 ways as a sum of consecutive naturals, for example, 2938585 + ... + 2938626.

It is an arithmetic number, because the mean of its divisors is an integer number (23508848).

Almost surely, 2^123421431 is an apocalyptic number.

123421431 is a deficient number, since it is larger than the sum of its proper divisors (64649353).

123421431 is an equidigital number, since it uses as much as digits as its factorization.

123421431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5877221.

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

The square root of 123421431 is about 11109.5198366086. The cubic root of 123421431 is about 497.8863186263.

Adding to 123421431 its reverse (134124321), we get a palindrome (257545752).

The spelling of 123421431 in words is "one hundred twenty-three million, four hundred twenty-one thousand, four hundred thirty-one".