208383421 has 2 divisors, whose sum is σ = 208383422. Its totient is φ = 208383420.

The previous prime is 208383341. The next prime is 208383481. The reversal of 208383421 is 124383802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193599396 + 14784025 = 13914^2 + 3845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208383421 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 (208383481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104191710 + 104191711.

It is an arithmetic number, because the mean of its divisors is an integer number (104191711).

Almost surely, 2^208383421 is an apocalyptic number.

It is an amenable number.

208383421 is a deficient number, since it is larger than the sum of its proper divisors (1).

208383421 is an equidigital number, since it uses as much as digits as its factorization.

208383421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 208383421 is about 14435.4917131354. The cubic root of 208383421 is about 592.8630553378.

The spelling of 208383421 in words is "two hundred eight million, three hundred eighty-three thousand, four hundred twenty-one".