210423 has 4 divisors (see below), whose sum is σ = 280568. Its totient is φ = 140280.

The previous prime is 210421. The next prime is 210437. The reversal of 210423 is 324012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 210423 - 2¹ = 210421 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210399 and 210408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35068 + ... + 35073.

It is an arithmetic number, because the mean of its divisors is an integer number (70142).

2²¹⁰⁴²³ is an apocalyptic number.

210423 is a deficient number, since it is larger than the sum of its proper divisors (70145).

210423 is an equidigital number, since it uses as much as digits as its factorization.

210423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70144.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 210423 is about 458.7188681535. The cubic root of 210423 is about 59.4791019517.

Adding to 210423 its reverse (324012), we get a palindrome (534435).

The spelling of 210423 in words is "two hundred ten thousand, four hundred twenty-three", and thus it is an iban number.