204024244220821 has 2 divisors, whose sum is σ = 204024244220822. Its totient is φ = 204024244220820.

The previous prime is 204024244220803. The next prime is 204024244220833. The reversal of 204024244220821 is 128022442420402.

204024244220821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114275886200100 + 89748358020721 = 10689990^2 + 9473561^2 .

It is a cyclic number.

It is not a de Polignac number, because 204024244220821 - 2⁹ = 204024244220309 is a prime.

It is a super-2 number, since 2×204024244220821² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204024244227821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102012122110410 + 102012122110411.

It is an arithmetic number, because the mean of its divisors is an integer number (102012122110411).

Almost surely, 2^{204024244220821} is an apocalyptic number.

It is an amenable number.

204024244220821 is a deficient number, since it is larger than the sum of its proper divisors (1).

204024244220821 is an equidigital number, since it uses as much as digits as its factorization.

204024244220821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131072, while the sum is 37.

The spelling of 204024244220821 in words is "two hundred four trillion, twenty-four billion, two hundred forty-four million, two hundred twenty thousand, eight hundred twenty-one".