423444221 has 8 divisors (see below), whose sum is σ = 443629824. Its totient is φ = 403666560.

The previous prime is 423444209. The next prime is 423444247. The reversal of 423444221 is 122444324.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 423444221 - 2⁶ = 423444157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423444271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99860 + ... + 104013.

It is an arithmetic number, because the mean of its divisors is an integer number (55453728).

Almost surely, 2^423444221 is an apocalyptic number.

It is an amenable number.

423444221 is a deficient number, since it is larger than the sum of its proper divisors (20185603).

423444221 is a wasteful number, since it uses less digits than its factorization.

423444221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203971.

The product of its digits is 6144, while the sum is 26.

The square root of 423444221 is about 20577.7603494647. The cubic root of 423444221 is about 750.9287581437.

Adding to 423444221 its reverse (122444324), we get a palindrome (545888545).

The spelling of 423444221 in words is "four hundred twenty-three million, four hundred forty-four thousand, two hundred twenty-one".