206441514645221 has 2 divisors, whose sum is σ = 206441514645222. Its totient is φ = 206441514645220.

The previous prime is 206441514645217. The next prime is 206441514645277. The reversal of 206441514645221 is 122546415144602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201922110604900 + 4519404040321 = 14209930^2 + 2125889^2 .

It is a cyclic number.

It is not a de Polignac number, because 206441514645221 - 2² = 206441514645217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206441514635221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103220757322610 + 103220757322611.

It is an arithmetic number, because the mean of its divisors is an integer number (103220757322611).

Almost surely, 2^{206441514645221} is an apocalyptic number.

It is an amenable number.

206441514645221 is a deficient number, since it is larger than the sum of its proper divisors (1).

206441514645221 is an equidigital number, since it uses as much as digits as its factorization.

206441514645221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1843200, while the sum is 47.

Adding to 206441514645221 its reverse (122546415144602), we get a palindrome (328987929789823).

The spelling of 206441514645221 in words is "two hundred six trillion, four hundred forty-one billion, five hundred fourteen million, six hundred forty-five thousand, two hundred twenty-one".