123204421 has 4 divisors (see below), whose sum is σ = 123662700. Its totient is φ = 122746144.

The previous prime is 123204397. The next prime is 123204439. The reversal of 123204421 is 124402321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124402321 = 8087 ⋅15383.

It can be written as a sum of positive squares in 2 ways, for example, as 2512225 + 120692196 = 1585^2 + 10986^2 .

It is a cyclic number.

It is not a de Polignac number, because 123204421 - 2¹⁹ = 122680133 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 (123204821) 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 3 ways as a sum of consecutive naturals, for example, 228736 + ... + 229273.

It is an arithmetic number, because the mean of its divisors is an integer number (30915675).

Almost surely, 2^123204421 is an apocalyptic number.

It is an amenable number.

123204421 is a deficient number, since it is larger than the sum of its proper divisors (458279).

123204421 is an equidigital number, since it uses as much as digits as its factorization.

123204421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458278.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 123204421 is about 11099.7486908488. The cubic root of 123204421 is about 497.5943388180.

Adding to 123204421 its reverse (124402321), we get a palindrome (247606742).

The spelling of 123204421 in words is "one hundred twenty-three million, two hundred four thousand, four hundred twenty-one".