206368821 has 12 divisors (see below), whose sum is σ = 298258272. Its totient is φ = 137500776.

The previous prime is 206368819. The next prime is 206368853. The reversal of 206368821 is 128863602.

It is not a de Polignac number, because 206368821 - 2¹ = 206368819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206368801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13290 + ... + 24276.

It is an arithmetic number, because the mean of its divisors is an integer number (24854856).

Almost surely, 2^206368821 is an apocalyptic number.

It is an amenable number.

206368821 is a deficient number, since it is larger than the sum of its proper divisors (91889451).

206368821 is a wasteful number, since it uses less digits than its factorization.

206368821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13080 (or 13077 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 206368821 is about 14365.5428369415. The cubic root of 206368821 is about 590.9463134171.

The spelling of 206368821 in words is "two hundred six million, three hundred sixty-eight thousand, eight hundred twenty-one".