208332221 has 2 divisors, whose sum is σ = 208332222. Its totient is φ = 208332220.

The previous prime is 208332211. The next prime is 208332239. The reversal of 208332221 is 122233802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191407225 + 16924996 = 13835^2 + 4114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208332221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208332211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104166110 + 104166111.

It is an arithmetic number, because the mean of its divisors is an integer number (104166111).

Almost surely, 2^208332221 is an apocalyptic number.

It is an amenable number.

208332221 is a deficient number, since it is larger than the sum of its proper divisors (1).

208332221 is an equidigital number, since it uses as much as digits as its factorization.

208332221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 208332221 is about 14433.7181973322. The cubic root of 208332221 is about 592.8144956929.

The spelling of 208332221 in words is "two hundred eight million, three hundred thirty-two thousand, two hundred twenty-one".