423345221 has 4 divisors (see below), whose sum is σ = 455910252. Its totient is φ = 390780192.

The previous prime is 423345217. The next prime is 423345253. The reversal of 423345221 is 122543324.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27772900 + 395572321 = 5270^2 + 19889^2 .

It is a cyclic number.

It is not a de Polignac number, because 423345221 - 2² = 423345217 is a prime.

It is a super-2 number, since 2×423345221² = 358442352287077682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423345281) 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, 16282496 + ... + 16282521.

It is an arithmetic number, because the mean of its divisors is an integer number (113977563).

Almost surely, 2^423345221 is an apocalyptic number.

It is an amenable number.

423345221 is a deficient number, since it is larger than the sum of its proper divisors (32565031).

423345221 is a wasteful number, since it uses less digits than its factorization.

423345221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32565030.

The product of its digits is 5760, while the sum is 26.

The square root of 423345221 is about 20575.3546992512. The cubic root of 423345221 is about 750.8702319454.

Adding to 423345221 its reverse (122543324), we get a palindrome (545888545).

The spelling of 423345221 in words is "four hundred twenty-three million, three hundred forty-five thousand, two hundred twenty-one".