206421206 has 16 divisors (see below), whose sum is σ = 326462400. Its totient is φ = 97618248.

The previous prime is 206421181. The next prime is 206421209. The reversal of 206421206 is 602124602.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206421209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20921 + ... + 29163.

It is an arithmetic number, because the mean of its divisors is an integer number (20403900).

Almost surely, 2^206421206 is an apocalyptic number.

206421206 is a deficient number, since it is larger than the sum of its proper divisors (120041194).

206421206 is a wasteful number, since it uses less digits than its factorization.

206421206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8923.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 206421206 is about 14367.3660077274. The cubic root of 206421206 is about 590.9963114473.

Adding to 206421206 its reverse (602124602), we get a palindrome (808545808).

The spelling of 206421206 in words is "two hundred six million, four hundred twenty-one thousand, two hundred six".