206432501221 has 2 divisors, whose sum is σ = 206432501222. Its totient is φ = 206432501220.

The previous prime is 206432501201. The next prime is 206432501239. The reversal of 206432501221 is 122105234602.

206432501221 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., 120659664321 + 85772836900 = 347361^2 + 292870^2 .

It is a cyclic number.

It is not a de Polignac number, because 206432501221 - 2⁵ = 206432501189 is a prime.

It is a super-2 number, since 2×206432501221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206432501221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206432501201) 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, 103216250610 + 103216250611.

It is an arithmetic number, because the mean of its divisors is an integer number (103216250611).

Almost surely, 2^206432501221 is an apocalyptic number.

It is an amenable number.

206432501221 is a deficient number, since it is larger than the sum of its proper divisors (1).

206432501221 is an equidigital number, since it uses as much as digits as its factorization.

206432501221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 206432501221 its reverse (122105234602), we get a palindrome (328537735823).

The spelling of 206432501221 in words is "two hundred six billion, four hundred thirty-two million, five hundred one thousand, two hundred twenty-one".