6613221 has 8 divisors (see below), whose sum is σ = 9336384. Its totient is φ = 4149440.

The previous prime is 6613219. The next prime is 6613223. The reversal of 6613221 is 1223166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6613219) and next prime (6613223).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6613221 - 2¹ = 6613219 is a prime.

6613221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6613223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64785 + ... + 64886.

It is an arithmetic number, because the mean of its divisors is an integer number (1167048).

Almost surely, 2^6613221 is an apocalyptic number.

It is an amenable number.

6613221 is a deficient number, since it is larger than the sum of its proper divisors (2723163).

6613221 is a wasteful number, since it uses less digits than its factorization.

6613221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129691.

The product of its digits is 432, while the sum is 21.

The square root of 6613221 is about 2571.6183620436. The cubic root of 6613221 is about 187.7029127727.

Adding to 6613221 its reverse (1223166), we get a palindrome (7836387).

The spelling of 6613221 in words is "six million, six hundred thirteen thousand, two hundred twenty-one".