6612221 has 16 divisors (see below), whose sum is σ = 8355840. Its totient is φ = 5082480.

The previous prime is 6612197. The next prime is 6612223. The reversal of 6612221 is 1222166.

It is a happy number.

6612221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6612221 - 2²² = 2417917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6612193 and 6612202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6612223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5540 + ... + 6626.

It is an arithmetic number, because the mean of its divisors is an integer number (522240).

Almost surely, 2^6612221 is an apocalyptic number.

It is an amenable number.

6612221 is a deficient number, since it is larger than the sum of its proper divisors (1743619).

6612221 is a wasteful number, since it uses less digits than its factorization.

6612221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184.

The product of its digits is 288, while the sum is 20.

The square root of 6612221 is about 2571.4239245990. The cubic root of 6612221 is about 187.6934513028.

Adding to 6612221 its reverse (1222166), we get a palindrome (7834387).

It can be divided in two parts, 661 and 2221, that added together give a palindrome (2882).

The spelling of 6612221 in words is "six million, six hundred twelve thousand, two hundred twenty-one".