204121243331 has 4 divisors (see below), whose sum is σ = 204915489672. Its totient is φ = 203326996992.

The previous prime is 204121243301. The next prime is 204121243349. The reversal of 204121243331 is 133342121402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204121243331 is a prime.

It is a super-2 number, since 2×204121243331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204121243331.

It is not an unprimeable number, because it can be changed into a prime (204121243301) 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, 397122785 + ... + 397123298.

It is an arithmetic number, because the mean of its divisors is an integer number (51228872418).

Almost surely, 2^204121243331 is an apocalyptic number.

204121243331 is a deficient number, since it is larger than the sum of its proper divisors (794246341).

204121243331 is an equidigital number, since it uses as much as digits as its factorization.

204121243331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794246340.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 204121243331 its reverse (133342121402), we get a palindrome (337463364733).

The spelling of 204121243331 in words is "two hundred four billion, one hundred twenty-one million, two hundred forty-three thousand, three hundred thirty-one".