210205423 has 2 divisors, whose sum is σ = 210205424. Its totient is φ = 210205422.

The previous prime is 210205421. The next prime is 210205453. The reversal of 210205423 is 324502012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210205423 - 2¹ = 210205421 is a prime.

Together with 210205421, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 210205423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210205421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105102711 + 105102712.

It is an arithmetic number, because the mean of its divisors is an integer number (105102712).

Almost surely, 2^210205423 is an apocalyptic number.

210205423 is a deficient number, since it is larger than the sum of its proper divisors (1).

210205423 is an equidigital number, since it uses as much as digits as its factorization.

210205423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 210205423 is about 14498.4627805847. The cubic root of 210205423 is about 594.5859445398.

Adding to 210205423 its reverse (324502012), we get a palindrome (534707435).

The spelling of 210205423 in words is "two hundred ten million, two hundred five thousand, four hundred twenty-three".