6711221 has 8 divisors (see below), whose sum is σ = 7557888. Its totient is φ = 5904000.

The previous prime is 6711217. The next prime is 6711227. The reversal of 6711221 is 1221176.

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 6711221 - 2² = 6711217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6711193 and 6711202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6711227) 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, 9500 + ... + 10181.

It is an arithmetic number, because the mean of its divisors is an integer number (944736).

Almost surely, 2^6711221 is an apocalyptic number.

It is an amenable number.

6711221 is a deficient number, since it is larger than the sum of its proper divisors (846667).

6711221 is a wasteful number, since it uses less digits than its factorization.

6711221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19723.

The product of its digits is 168, while the sum is 20.

The square root of 6711221 is about 2590.6024395881. The cubic root of 6711221 is about 188.6255475379.

Adding to 6711221 its reverse (1221176), we get a palindrome (7932397).

The spelling of 6711221 in words is "six million, seven hundred eleven thousand, two hundred twenty-one".