4431421 has 4 divisors (see below), whose sum is σ = 4439200. Its totient is φ = 4423644.

The previous prime is 4431367. The next prime is 4431443. The reversal of 4431421 is 1241344.

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 4431421 - 2⁷ = 4431293 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 (4431491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2961 + ... + 4198.

It is an arithmetic number, because the mean of its divisors is an integer number (1109800).

Almost surely, 2^4431421 is an apocalyptic number.

It is an amenable number.

4431421 is a deficient number, since it is larger than the sum of its proper divisors (7779).

4431421 is an equidigital number, since it uses as much as digits as its factorization.

4431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7778.

The product of its digits is 384, while the sum is 19.

The square root of 4431421 is about 2105.0940596562. The cubic root of 4431421 is about 164.2533882927.

Adding to 4431421 its reverse (1241344), we get a palindrome (5672765).

The spelling of 4431421 in words is "four million, four hundred thirty-one thousand, four hundred twenty-one".