209083421 has 2 divisors, whose sum is σ = 209083422. Its totient is φ = 209083420.

The previous prime is 209083397. The next prime is 209083423. The reversal of 209083421 is 124380902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174108025 + 34975396 = 13195^2 + 5914^2 .

It is a cyclic number.

It is not a de Polignac number, because 209083421 - 2²⁶ = 141974557 is a prime.

Together with 209083423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209083423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104541710 + 104541711.

It is an arithmetic number, because the mean of its divisors is an integer number (104541711).

Almost surely, 2^209083421 is an apocalyptic number.

It is an amenable number.

209083421 is a deficient number, since it is larger than the sum of its proper divisors (1).

209083421 is an equidigital number, since it uses as much as digits as its factorization.

209083421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 209083421 is about 14459.7171825731. The cubic root of 209083421 is about 593.5261604114.

The spelling of 209083421 in words is "two hundred nine million, eighty-three thousand, four hundred twenty-one".