423321521 has 4 divisors (see below), whose sum is σ = 483796032. Its totient is φ = 362847012.

The previous prime is 423321511. The next prime is 423321529. The reversal of 423321521 is 125123324.

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 423321521 - 2²² = 419127217 is a prime.

It is a super-2 number, since 2×423321521² = 358402220283506882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (423321529) 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, 30237245 + ... + 30237258.

It is an arithmetic number, because the mean of its divisors is an integer number (120949008).

Almost surely, 2^423321521 is an apocalyptic number.

It is an amenable number.

423321521 is a deficient number, since it is larger than the sum of its proper divisors (60474511).

423321521 is an equidigital number, since it uses as much as digits as its factorization.

423321521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60474510.

The product of its digits is 1440, while the sum is 23.

The square root of 423321521 is about 20574.7787594423. The cubic root of 423321521 is about 750.8562197746.

Adding to 423321521 its reverse (125123324), we get a palindrome (548444845).

The spelling of 423321521 in words is "four hundred twenty-three million, three hundred twenty-one thousand, five hundred twenty-one".