6724221 has 24 divisors (see below), whose sum is σ = 10533600. Its totient is φ = 3804192.

The previous prime is 6724219. The next prime is 6724229. The reversal of 6724221 is 1224276.

It is not a de Polignac number, because 6724221 - 2¹ = 6724219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6724191 and 6724200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6724229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21750 + ... + 22056.

It is an arithmetic number, because the mean of its divisors is an integer number (438900).

Almost surely, 2^6724221 is an apocalyptic number.

It is an amenable number.

6724221 is a deficient number, since it is larger than the sum of its proper divisors (3809379).

6724221 is a wasteful number, since it uses less digits than its factorization.

6724221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 466 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 6724221 is about 2593.1102946076. The cubic root of 6724221 is about 188.7472616301.

Adding to 6724221 its reverse (1224276), we get a palindrome (7948497).

Subtracting from 6724221 its reverse (1224276), we obtain a palindrome (5499945).

The spelling of 6724221 in words is "six million, seven hundred twenty-four thousand, two hundred twenty-one".