208229221 has 4 divisors (see below), whose sum is σ = 210376012. Its totient is φ = 206082432.

The previous prime is 208229213. The next prime is 208229237. The reversal of 208229221 is 122922802.

208229221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 129640996 + 78588225 = 11386^2 + 8865^2 .

It is a cyclic number.

It is not a de Polignac number, because 208229221 - 2³ = 208229213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 208229221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208229261) 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, 1073250 + ... + 1073443.

It is an arithmetic number, because the mean of its divisors is an integer number (52594003).

Almost surely, 2^208229221 is an apocalyptic number.

It is an amenable number.

208229221 is a deficient number, since it is larger than the sum of its proper divisors (2146791).

208229221 is an equidigital number, since it uses as much as digits as its factorization.

208229221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146790.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 208229221 is about 14430.1497220230. The cubic root of 208229221 is about 592.7167832375.

The spelling of 208229221 in words is "two hundred eight million, two hundred twenty-nine thousand, two hundred twenty-one".