6683221 has 6 divisors (see below), whose sum is σ = 6813366. Its totient is φ = 6553800.

The previous prime is 6683213. The next prime is 6683233. The reversal of 6683221 is 1223866.

It can be written as a sum of positive squares in only one way, i.e., 3944196 + 2739025 = 1986^2 + 1655^2 .

It is not a de Polignac number, because 6683221 - 2³ = 6683213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6683221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6683251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20026 + ... + 20356.

It is an arithmetic number, because the mean of its divisors is an integer number (1135561).

Almost surely, 2^6683221 is an apocalyptic number.

6683221 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6683221 is a deficient number, since it is larger than the sum of its proper divisors (130145).

6683221 is an frugal number, since it uses more digits than its factorization.

6683221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723 (or 392 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 6683221 is about 2585.1926427251. The cubic root of 6683221 is about 188.3628592512.

The spelling of 6683221 in words is "six million, six hundred eighty-three thousand, two hundred twenty-one".