204021841643 has 2 divisors, whose sum is σ = 204021841644. Its totient is φ = 204021841642.

The previous prime is 204021841631. The next prime is 204021841657. The reversal of 204021841643 is 346148120402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204021841643 - 2¹⁸ = 204021579499 is a prime.

It is not a weakly prime, because it can be changed into another prime (204021840643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102010920821 + 102010920822.

It is an arithmetic number, because the mean of its divisors is an integer number (102010920822).

Almost surely, 2^204021841643 is an apocalyptic number.

204021841643 is a deficient number, since it is larger than the sum of its proper divisors (1).

204021841643 is an equidigital number, since it uses as much as digits as its factorization.

204021841643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 35.

The spelling of 204021841643 in words is "two hundred four billion, twenty-one million, eight hundred forty-one thousand, six hundred forty-three".