4420421 has 2 divisors, whose sum is σ = 4420422. Its totient is φ = 4420420.

The previous prime is 4420417. The next prime is 4420453. The reversal of 4420421 is 1240244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3496900 + 923521 = 1870^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 4420421 - 2² = 4420417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4420421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4420721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2210210 + 2210211.

It is an arithmetic number, because the mean of its divisors is an integer number (2210211).

Almost surely, 2^4420421 is an apocalyptic number.

It is an amenable number.

4420421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4420421 is an equidigital number, since it uses as much as digits as its factorization.

4420421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 4420421 is about 2102.4797264183. The cubic root of 4420421 is about 164.1173683933.

Adding to 4420421 its reverse (1240244), we get a palindrome (5660665).

The spelling of 4420421 in words is "four million, four hundred twenty thousand, four hundred twenty-one".