4221409 has 2 divisors, whose sum is σ = 4221410. Its totient is φ = 4221408.

The previous prime is 4221407. The next prime is 4221419. The reversal of 4221409 is 9041224.

4221409 is nontrivially palindromic in base 12.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3411409 + 810000 = 1847^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221409 - 2¹ = 4221407 is a prime.

Together with 4221407, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 4221409.

It is not a weakly prime, because it can be changed into another prime (4221407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110704 + 2110705.

It is an arithmetic number, because the mean of its divisors is an integer number (2110705).

Almost surely, 2^4221409 is an apocalyptic number.

It is an amenable number.

4221409 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221409 is an equidigital number, since it uses as much as digits as its factorization.

4221409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 4221409 is about 2054.6067750302. The cubic root of 4221409 is about 161.6165421299.

The spelling of 4221409 in words is "four million, two hundred twenty-one thousand, four hundred nine".