204123221311 has 2 divisors, whose sum is σ = 204123221312. Its totient is φ = 204123221310.

The previous prime is 204123221297. The next prime is 204123221317. The reversal of 204123221311 is 113122321402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204123221311 - 2⁵ = 204123221279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204123221317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102061610655 + 102061610656.

It is an arithmetic number, because the mean of its divisors is an integer number (102061610656).

Almost surely, 2^204123221311 is an apocalyptic number.

204123221311 is a deficient number, since it is larger than the sum of its proper divisors (1).

204123221311 is an equidigital number, since it uses as much as digits as its factorization.

204123221311 is an evil number, because the sum of its binary digits is even.

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

Adding to 204123221311 its reverse (113122321402), we get a palindrome (317245542713).

The spelling of 204123221311 in words is "two hundred four billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred eleven".