204122121311 has 4 divisors (see below), whose sum is σ = 208869147432. Its totient is φ = 199375095192.

The previous prime is 204122121299. The next prime is 204122121341. The reversal of 204122121311 is 113121221402.

204122121311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 204122121311 - 2¹⁸ = 204121859167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204122121341) 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 3 ways as a sum of consecutive naturals, for example, 2373512996 + ... + 2373513081.

It is an arithmetic number, because the mean of its divisors is an integer number (52217286858).

Almost surely, 2^204122121311 is an apocalyptic number.

204122121311 is a deficient number, since it is larger than the sum of its proper divisors (4747026121).

204122121311 is an equidigital number, since it uses as much as digits as its factorization.

204122121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747026120.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 204122121311 its reverse (113121221402), we get a palindrome (317243342713).

The spelling of 204122121311 in words is "two hundred four billion, one hundred twenty-two million, one hundred twenty-one thousand, three hundred eleven".