123204121 has 4 divisors (see below), whose sum is σ = 124688592. Its totient is φ = 121719652.

The previous prime is 123204101. The next prime is 123204127. The reversal of 123204121 is 121402321.

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 a cyclic number.

It is not a de Polignac number, because 123204121 - 2¹⁹ = 122679833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123204095 and 123204104.

It is not an unprimeable number, because it can be changed into a prime (123204127) 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, 742111 + ... + 742276.

It is an arithmetic number, because the mean of its divisors is an integer number (31172148).

Almost surely, 2^123204121 is an apocalyptic number.

It is an amenable number.

123204121 is a deficient number, since it is larger than the sum of its proper divisors (1484471).

123204121 is an equidigital number, since it uses as much as digits as its factorization.

123204121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484470.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 123204121 is about 11099.7351770211. The cubic root of 123204121 is about 497.5939349406.

Adding to 123204121 its reverse (121402321), we get a palindrome (244606442).

The spelling of 123204121 in words is "one hundred twenty-three million, two hundred four thousand, one hundred twenty-one".