206421203 has 4 divisors (see below), whose sum is σ = 206468208. Its totient is φ = 206374200.

The previous prime is 206421181. The next prime is 206421209. The reversal of 206421203 is 302124602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206421203 - 2⁶ = 206421139 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 16148 + ... + 25953.

It is an arithmetic number, because the mean of its divisors is an integer number (51617052).

Almost surely, 2^206421203 is an apocalyptic number.

206421203 is a deficient number, since it is larger than the sum of its proper divisors (47005).

206421203 is an equidigital number, since it uses as much as digits as its factorization.

206421203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47004.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 206421203 is about 14367.3659033241. The cubic root of 206421203 is about 590.9963085842.

Adding to 206421203 its reverse (302124602), we get a palindrome (508545805).

The spelling of 206421203 in words is "two hundred six million, four hundred twenty-one thousand, two hundred three".