208055221 has 4 divisors (see below), whose sum is σ = 226969344. Its totient is φ = 189141100.

The previous prime is 208055207. The next prime is 208055233. The reversal of 208055221 is 122550802.

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 a cyclic number.

It is not a de Polignac number, because 208055221 - 2⁷ = 208055093 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 (208055321) 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, 9457045 + ... + 9457066.

It is an arithmetic number, because the mean of its divisors is an integer number (56742336).

Almost surely, 2^208055221 is an apocalyptic number.

It is an amenable number.

208055221 is a deficient number, since it is larger than the sum of its proper divisors (18914123).

208055221 is a wasteful number, since it uses less digits than its factorization.

208055221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18914122.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 208055221 is about 14424.1194185295. The cubic root of 208055221 is about 592.5516423739.

The spelling of 208055221 in words is "two hundred eight million, fifty-five thousand, two hundred twenty-one".