6613421 has 4 divisors (see below), whose sum is σ = 6841500. Its totient is φ = 6385344.

The previous prime is 6613361. The next prime is 6613429. The reversal of 6613421 is 1243166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243166 = 2 ⋅621583.

It can be written as a sum of positive squares in 2 ways, for example, as 4622500 + 1990921 = 2150^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 6613421 - 2¹⁸ = 6351277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6613429) 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 in 3 ways as a sum of consecutive naturals, for example, 113996 + ... + 114053.

It is an arithmetic number, because the mean of its divisors is an integer number (1710375).

Almost surely, 2^6613421 is an apocalyptic number.

It is an amenable number.

6613421 is a deficient number, since it is larger than the sum of its proper divisors (228079).

6613421 is a wasteful number, since it uses less digits than its factorization.

6613421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228078.

The product of its digits is 864, while the sum is 23.

The square root of 6613421 is about 2571.6572477685. The cubic root of 6613421 is about 187.7048049523.

Adding to 6613421 its reverse (1243166), we get a palindrome (7856587).

The spelling of 6613421 in words is "six million, six hundred thirteen thousand, four hundred twenty-one".