204621521465189 has 2 divisors, whose sum is σ = 204621521465190. Its totient is φ = 204621521465188.

The previous prime is 204621521465107. The next prime is 204621521465233. The reversal of 204621521465189 is 981564125126402.

204621521465189 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., 204029942049025 + 591579416164 = 14283905^2 + 769142^2 .

It is a cyclic number.

It is not a de Polignac number, because 204621521465189 - 2²⁰ = 204621520416613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204621521465789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102310760732594 + 102310760732595.

It is an arithmetic number, because the mean of its divisors is an integer number (102310760732595).

Almost surely, 2^{204621521465189} is an apocalyptic number.

It is an amenable number.

204621521465189 is a deficient number, since it is larger than the sum of its proper divisors (1).

204621521465189 is an equidigital number, since it uses as much as digits as its factorization.

204621521465189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8294400, while the sum is 56.

The spelling of 204621521465189 in words is "two hundred four trillion, six hundred twenty-one billion, five hundred twenty-one million, four hundred sixty-five thousand, one hundred eighty-nine".