206023221 has 48 divisors (see below), whose sum is σ = 331905600. Its totient is φ = 122540544.

The previous prime is 206023211. The next prime is 206023229. The reversal of 206023221 is 122320602.

206023221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206023221 - 2¹¹ = 206021173 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 206023194 and 206023203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206023229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 261390 + ... + 262176.

It is an arithmetic number, because the mean of its divisors is an integer number (6914700).

Almost surely, 2^206023221 is an apocalyptic number.

It is an amenable number.

206023221 is a deficient number, since it is larger than the sum of its proper divisors (125882379).

206023221 is a wasteful number, since it uses less digits than its factorization.

206023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 895 counting only the distinct ones).

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

The square root of 206023221 is about 14353.5090134782. The cubic root of 206023221 is about 590.6162487659.

Adding to 206023221 its reverse (122320602), we get a palindrome (328343823).

It can be divided in two parts, 2060 and 23221, that added together give a square (25281 = 159²).

The spelling of 206023221 in words is "two hundred six million, twenty-three thousand, two hundred twenty-one".