4402421 has 2 divisors, whose sum is σ = 4402422. Its totient is φ = 4402420.

The previous prime is 4402399. The next prime is 4402423. The reversal of 4402421 is 1242044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 1716100 = 1639^2 + 1310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4402421 is a prime.

It is a super-2 number, since 2×4402421² = 38762621322482, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 4402423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4402421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4402423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2201210 + 2201211.

It is an arithmetic number, because the mean of its divisors is an integer number (2201211).

Almost surely, 2^4402421 is an apocalyptic number.

It is an amenable number.

4402421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4402421 is an equidigital number, since it uses as much as digits as its factorization.

4402421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 4402421 is about 2098.1947002125. The cubic root of 4402421 is about 163.8943028035.

Adding to 4402421 its reverse (1242044), we get a palindrome (5644465).

The spelling of 4402421 in words is "four million, four hundred two thousand, four hundred twenty-one".