1224221 has 16 divisors (see below), whose sum is σ = 1410048.
Its totient is φ = 1056000.
The previous prime is 1224217. The next prime is 1224229.
1224221 = 1732 + 1742 + ... + 2062.
1224221 is nontrivially palindromic in base 10.
It is a cyclic number.
It is not a de Polignac number, because 1224221 - 22 = 1224217 is a prime.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 1224196 and 1224205.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1224229) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12071 + ... + 12171.
It is an arithmetic number, because the mean of its divisors is an integer number (88128).
21224221 is an apocalyptic number.
It is an amenable number.
1224221 is a deficient number, since it is larger than the sum of its proper divisors (185827).
1224221 is a wasteful number, since it uses less digits than its factorization.
1224221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 172.
The product of its digits is 64, while the sum is 14.
The square root of 1224221 is about 1106.4452087654.
The cubic root of 1224221 is about 106.9760624240.
The spelling of 1224221 in words is "one million, two hundred twenty-four thousand, two hundred twenty-one".