6604212421 has 2 divisors, whose sum is σ = 6604212422. Its totient is φ = 6604212420.

The previous prime is 6604212409. The next prime is 6604212431. The reversal of 6604212421 is 1242124066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6322476196 + 281736225 = 79514^2 + 16785^2 .

It is a cyclic number.

It is not a de Polignac number, because 6604212421 - 2⁵ = 6604212389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6604212421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6604212431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3302106210 + 3302106211.

It is an arithmetic number, because the mean of its divisors is an integer number (3302106211).

Almost surely, 2^6604212421 is an apocalyptic number.

It is an amenable number.

6604212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6604212421 is an equidigital number, since it uses as much as digits as its factorization.

6604212421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 6604212421 is about 81266.3055700208. The cubic root of 6604212421 is about 1876.1764394019.

Adding to 6604212421 its reverse (1242124066), we get a palindrome (7846336487).

The spelling of 6604212421 in words is "six billion, six hundred four million, two hundred twelve thousand, four hundred twenty-one".