206224021 has 2 divisors, whose sum is σ = 206224022. Its totient is φ = 206224020.

The previous prime is 206224013. The next prime is 206224027. The reversal of 206224021 is 120422602.

206224021 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., 196700625 + 9523396 = 14025^2 + 3086^2 .

It is a cyclic number.

It is not a de Polignac number, because 206224021 - 2³ = 206224013 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206224021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206224027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103112010 + 103112011.

It is an arithmetic number, because the mean of its divisors is an integer number (103112011).

Almost surely, 2^206224021 is an apocalyptic number.

It is an amenable number.

206224021 is a deficient number, since it is larger than the sum of its proper divisors (1).

206224021 is an equidigital number, since it uses as much as digits as its factorization.

206224021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 206224021 is about 14360.5021151769. The cubic root of 206224021 is about 590.8080673279.

Adding to 206224021 its reverse (120422602), we get a palindrome (326646623).

The spelling of 206224021 in words is "two hundred six million, two hundred twenty-four thousand, twenty-one".