4443421 has 2 divisors, whose sum is σ = 4443422. Its totient is φ = 4443420.

The previous prime is 4443419. The next prime is 4443431. The reversal of 4443421 is 1243444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3463321 + 980100 = 1861^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 4443421 - 2¹ = 4443419 is a prime.

Together with 4443419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 4443392 and 4443401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4443401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2221710 + 2221711.

It is an arithmetic number, because the mean of its divisors is an integer number (2221711).

Almost surely, 2^4443421 is an apocalyptic number.

It is an amenable number.

4443421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4443421 is an equidigital number, since it uses as much as digits as its factorization.

4443421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 22.

The square root of 4443421 is about 2107.9423616408. The cubic root of 4443421 is about 164.4015171646.

Adding to 4443421 its reverse (1243444), we get a palindrome (5686865).

The spelling of 4443421 in words is "four million, four hundred forty-three thousand, four hundred twenty-one".