123432321 has 4 divisors (see below), whose sum is σ = 164576432. Its totient is φ = 82288212.

The previous prime is 123432319. The next prime is 123432347. The reversal of 123432321 is 123234321.

123432321 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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.

It is not a de Polignac number, because 123432321 - 2¹ = 123432319 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123432391) 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, 20572051 + ... + 20572056.

It is an arithmetic number, because the mean of its divisors is an integer number (41144108).

Almost surely, 2^123432321 is an apocalyptic number.

It is an amenable number.

123432321 is a deficient number, since it is larger than the sum of its proper divisors (41144111).

123432321 is an equidigital number, since it uses as much as digits as its factorization.

123432321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41144110.

The product of its digits is 864, while the sum is 21.

The square root of 123432321 is about 11110.0099459901. The cubic root of 123432321 is about 497.9009617412.

Adding to 123432321 its reverse (123234321), we get a palindrome (246666642).

It can be divided in two parts, 123432 and 321, that added together give a triangular number (123753 = T₄₉₇).

The spelling of 123432321 in words is "one hundred twenty-three million, four hundred thirty-two thousand, three hundred twenty-one".