423210421 has 4 divisors (see below), whose sum is σ = 423690592. Its totient is φ = 422730252.

The previous prime is 423210413. The next prime is 423210433. The reversal of 423210421 is 124012324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 423210421 - 2³ = 423210413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423211421) 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 in 3 ways as a sum of consecutive naturals, for example, 238761 + ... + 240526.

It is an arithmetic number, because the mean of its divisors is an integer number (105922648).

Almost surely, 2^423210421 is an apocalyptic number.

It is an amenable number.

423210421 is a deficient number, since it is larger than the sum of its proper divisors (480171).

423210421 is an equidigital number, since it uses as much as digits as its factorization.

423210421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480170.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 423210421 is about 20572.0786747475. The cubic root of 423210421 is about 750.7905270558.

Adding to 423210421 its reverse (124012324), we get a palindrome (547222745).

The spelling of 423210421 in words is "four hundred twenty-three million, two hundred ten thousand, four hundred twenty-one".