206043021 has 20 divisors (see below), whose sum is σ = 308195712. Its totient is φ = 137182248.

The previous prime is 206043001. The next prime is 206043029. The reversal of 206043021 is 120340602.

It is a happy number.

It is not a de Polignac number, because 206043021 - 2⁹ = 206042509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206042985 and 206043003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206043029) 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 19 ways as a sum of consecutive naturals, for example, 95076 + ... + 97218.

Almost surely, 2^206043021 is an apocalyptic number.

It is an amenable number.

206043021 is a deficient number, since it is larger than the sum of its proper divisors (102152691).

206043021 is a wasteful number, since it uses less digits than its factorization.

206043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342 (or 3333 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 206043021 is about 14354.1987237184. The cubic root of 206043021 is about 590.6351686836.

Adding to 206043021 its reverse (120340602), we get a palindrome (326383623).

The spelling of 206043021 in words is "two hundred six million, forty-three thousand, twenty-one".