206500117721 has 16 divisors (see below), whose sum is σ = 210800446080. Its totient is φ = 202246156800.

The previous prime is 206500117711. The next prime is 206500117729. The reversal of 206500117721 is 127711005602.

206500117721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 206500117721 - 2¹⁴ = 206500101337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206500117729) 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 in 15 ways as a sum of consecutive naturals, for example, 26046260 + ... + 26054186.

It is an arithmetic number, because the mean of its divisors is an integer number (13175027880).

Almost surely, 2^206500117721 is an apocalyptic number.

It is an amenable number.

206500117721 is a deficient number, since it is larger than the sum of its proper divisors (4300328359).

206500117721 is a wasteful number, since it uses less digits than its factorization.

206500117721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10784.

The product of its (nonzero) digits is 5880, while the sum is 32.

The spelling of 206500117721 in words is "two hundred six billion, five hundred million, one hundred seventeen thousand, seven hundred twenty-one".