206453221 has 16 divisors (see below), whose sum is σ = 244218240. Its totient is φ = 172687680.

The previous prime is 206453209. The next prime is 206453227. The reversal of 206453221 is 122354602.

It is not a de Polignac number, because 206453221 - 2⁵ = 206453189 is a prime.

It is a super-2 number, since 2×206453221² = 85245864922549682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206453227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12490 + ... + 23851.

It is an arithmetic number, because the mean of its divisors is an integer number (15263640).

Almost surely, 2^206453221 is an apocalyptic number.

It is an amenable number.

206453221 is a deficient number, since it is larger than the sum of its proper divisors (37765019).

206453221 is a wasteful number, since it uses less digits than its factorization.

206453221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36396.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 206453221 is about 14368.4801214325. The cubic root of 206453221 is about 591.0268634905.

The spelling of 206453221 in words is "two hundred six million, four hundred fifty-three thousand, two hundred twenty-one".