423105021 has 24 divisors (see below), whose sum is σ = 621915840. Its totient is φ = 277142976.

The previous prime is 423105017. The next prime is 423105029. The reversal of 423105021 is 120501324.

It is not a de Polignac number, because 423105021 - 2² = 423105017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 423104985 and 423105003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423105029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132186 + ... + 135348.

It is an arithmetic number, because the mean of its divisors is an integer number (25913160).

Almost surely, 2^423105021 is an apocalyptic number.

It is an amenable number.

423105021 is a deficient number, since it is larger than the sum of its proper divisors (198810819).

423105021 is a wasteful number, since it uses less digits than its factorization.

423105021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425 (or 3422 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 423105021 is about 20569.5167906298. The cubic root of 423105021 is about 750.7281940823.

Adding to 423105021 its reverse (120501324), we get a palindrome (543606345).

The spelling of 423105021 in words is "four hundred twenty-three million, one hundred five thousand, twenty-one".