206113603921 has 2 divisors, whose sum is σ = 206113603922. Its totient is φ = 206113603920.

The previous prime is 206113603909. The next prime is 206113603981. The reversal of 206113603921 is 129306311602.

206113603921 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., 181373774400 + 24739829521 = 425880^2 + 157289^2 .

It is a cyclic number.

It is not a de Polignac number, because 206113603921 - 2⁵ = 206113603889 is a prime.

It is not a weakly prime, because it can be changed into another prime (206113603981) 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, 103056801960 + 103056801961.

It is an arithmetic number, because the mean of its divisors is an integer number (103056801961).

Almost surely, 2^206113603921 is an apocalyptic number.

It is an amenable number.

206113603921 is a deficient number, since it is larger than the sum of its proper divisors (1).

206113603921 is an equidigital number, since it uses as much as digits as its factorization.

206113603921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 206113603921 in words is "two hundred six billion, one hundred thirteen million, six hundred three thousand, nine hundred twenty-one".