204121123421 has 8 divisors (see below), whose sum is σ = 204299007960. Its totient is φ = 203943313728.

The previous prime is 204121123411. The next prime is 204121123537. The reversal of 204121123421 is 124321121402.

204121123421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 107527591396 + 96593532025 = 327914^2 + 310795^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 204121123421 - 2⁶ = 204121123357 is a prime.

It is a super-2 number, since 2×204121123421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204121123411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6347435 + ... + 6379511.

It is an arithmetic number, because the mean of its divisors is an integer number (25537375995).

Almost surely, 2^204121123421 is an apocalyptic number.

It is an amenable number.

204121123421 is a deficient number, since it is larger than the sum of its proper divisors (177884539).

204121123421 is a wasteful number, since it uses less digits than its factorization.

204121123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37423.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 204121123421 its reverse (124321121402), we get a palindrome (328442244823).

The spelling of 204121123421 in words is "two hundred four billion, one hundred twenty-one million, one hundred twenty-three thousand, four hundred twenty-one".