423210521 has 4 divisors (see below), whose sum is σ = 423535632. Its totient is φ = 422885412.

The previous prime is 423210509. The next prime is 423210553. The reversal of 423210521 is 125012324.

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 423210521 - 2⁶ = 423210457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423210493 and 423210502.

It is not an unprimeable number, because it can be changed into a prime (423210581) 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, 160595 + ... + 163208.

It is an arithmetic number, because the mean of its divisors is an integer number (105883908).

Almost surely, 2^423210521 is an apocalyptic number.

It is an amenable number.

423210521 is a deficient number, since it is larger than the sum of its proper divisors (325111).

423210521 is a wasteful number, since it uses less digits than its factorization.

423210521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325110.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 423210521 is about 20572.0811052261. The cubic root of 423210521 is about 750.7905861903.

Adding to 423210521 its reverse (125012324), we get a palindrome (548222845).

The spelling of 423210521 in words is "four hundred twenty-three million, two hundred ten thousand, five hundred twenty-one".