204255105221 has 2 divisors, whose sum is σ = 204255105222. Its totient is φ = 204255105220.

The previous prime is 204255105217. The next prime is 204255105259. The reversal of 204255105221 is 122501552402.

It is a happy number.

204255105221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189203250625 + 15051854596 = 434975^2 + 122686^2 .

It is a cyclic number.

It is not a de Polignac number, because 204255105221 - 2² = 204255105217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204255165221) 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 as a sum of consecutive naturals, namely, 102127552610 + 102127552611.

It is an arithmetic number, because the mean of its divisors is an integer number (102127552611).

Almost surely, 2^204255105221 is an apocalyptic number.

It is an amenable number.

204255105221 is a deficient number, since it is larger than the sum of its proper divisors (1).

204255105221 is an equidigital number, since it uses as much as digits as its factorization.

204255105221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 204255105221 its reverse (122501552402), we get a palindrome (326756657623).

The spelling of 204255105221 in words is "two hundred four billion, two hundred fifty-five million, one hundred five thousand, two hundred twenty-one".