206629221 has 4 divisors (see below), whose sum is σ = 275505632. Its totient is φ = 137752812.

The previous prime is 206629207. The next prime is 206629231. The reversal of 206629221 is 122926602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 206629221 - 2¹¹ = 206627173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206629231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34438201 + ... + 34438206.

It is an arithmetic number, because the mean of its divisors is an integer number (68876408).

Almost surely, 2^206629221 is an apocalyptic number.

It is an amenable number.

206629221 is a deficient number, since it is larger than the sum of its proper divisors (68876411).

206629221 is an equidigital number, since it uses as much as digits as its factorization.

206629221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68876410.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 206629221 is about 14374.6033336576. The cubic root of 206629221 is about 591.1947646135.

The spelling of 206629221 in words is "two hundred six million, six hundred twenty-nine thousand, two hundred twenty-one".