206633212221 has 16 divisors (see below), whose sum is σ = 284710699008. Its totient is φ = 133165359600.

The previous prime is 206633212211. The next prime is 206633212241. The reversal of 206633212221 is 122212336602.

It is not a de Polignac number, because 206633212221 - 2⁵ = 206633212189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206633212211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1134741 + ... + 1304186.

It is an arithmetic number, because the mean of its divisors is an integer number (17794418688).

Almost surely, 2^206633212221 is an apocalyptic number.

It is an amenable number.

206633212221 is a deficient number, since it is larger than the sum of its proper divisors (78077486787).

206633212221 is a wasteful number, since it uses less digits than its factorization.

206633212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439872.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 206633212221 its reverse (122212336602), we get a palindrome (328845548823).

The spelling of 206633212221 in words is "two hundred six billion, six hundred thirty-three million, two hundred twelve thousand, two hundred twenty-one".