204123121321 has 8 divisors (see below), whose sum is σ = 233296197824. Its totient is φ = 174953202480.

The previous prime is 204123121261. The next prime is 204123121333. The reversal of 204123121321 is 123121321402.

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

It is not a de Polignac number, because 204123121321 - 2¹⁹ = 204122597033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204123121292 and 204123121301.

It is not an unprimeable number, because it can be changed into a prime (204123122321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 649230 + ... + 910903.

It is an arithmetic number, because the mean of its divisors is an integer number (29162024728).

Almost surely, 2^204123121321 is an apocalyptic number.

It is an amenable number.

204123121321 is a deficient number, since it is larger than the sum of its proper divisors (29173076503).

204123121321 is a wasteful number, since it uses less digits than its factorization.

204123121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578831.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 204123121321 its reverse (123121321402), we get a palindrome (327244442723).

The spelling of 204123121321 in words is "two hundred four billion, one hundred twenty-three million, one hundred twenty-one thousand, three hundred twenty-one".