6604421 has 2 divisors, whose sum is σ = 6604422. Its totient is φ = 6604420.

The previous prime is 6604399. The next prime is 6604469. The reversal of 6604421 is 1244066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4950625 + 1653796 = 2225^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 6604421 - 2⁶ = 6604357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6604471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3302210 + 3302211.

It is an arithmetic number, because the mean of its divisors is an integer number (3302211).

Almost surely, 2^6604421 is an apocalyptic number.

It is an amenable number.

6604421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6604421 is an equidigital number, since it uses as much as digits as its factorization.

6604421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 6604421 is about 2569.9068076489. The cubic root of 6604421 is about 187.6196190780.

Adding to 6604421 its reverse (1244066), we get a palindrome (7848487).

The spelling of 6604421 in words is "six million, six hundred four thousand, four hundred twenty-one".