423412021 has 4 divisors (see below), whose sum is σ = 423493344. Its totient is φ = 423330700.

The previous prime is 423412019. The next prime is 423412051. The reversal of 423412021 is 120214324.

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 423412021 - 2¹ = 423412019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 423412021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423412051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32275 + ... + 43456.

It is an arithmetic number, because the mean of its divisors is an integer number (105873336).

Almost surely, 2^423412021 is an apocalyptic number.

It is an amenable number.

423412021 is a deficient number, since it is larger than the sum of its proper divisors (81323).

423412021 is an equidigital number, since it uses as much as digits as its factorization.

423412021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81322.

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

The square root of 423412021 is about 20576.9779365192. The cubic root of 423412021 is about 750.9097233510.

Adding to 423412021 its reverse (120214324), we get a palindrome (543626345).

The spelling of 423412021 in words is "four hundred twenty-three million, four hundred twelve thousand, twenty-one".