204411400121 has 4 divisors (see below), whose sum is σ = 204595721700. Its totient is φ = 204227078544.

The previous prime is 204411400069. The next prime is 204411400147. The reversal of 204411400121 is 121004114402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121004114402 = 2 ⋅60502057201.

It can be written as a sum of positive squares in 2 ways, for example, as 39523428025 + 164887972096 = 198805^2 + 406064^2 .

It is a cyclic number.

It is not a de Polignac number, because 204411400121 - 2¹⁰ = 204411399097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204411400093 and 204411400102.

It is not an unprimeable number, because it can be changed into a prime (204411420121) 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, 92159126 + ... + 92161343.

It is an arithmetic number, because the mean of its divisors is an integer number (51148930425).

Almost surely, 2^204411400121 is an apocalyptic number.

It is an amenable number.

204411400121 is a deficient number, since it is larger than the sum of its proper divisors (184321579).

204411400121 is a wasteful number, since it uses less digits than its factorization.

204411400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184321578.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 204411400121 its reverse (121004114402), we get a palindrome (325415514523).

The spelling of 204411400121 in words is "two hundred four billion, four hundred eleven million, four hundred thousand, one hundred twenty-one".