1330221 has 4 divisors (see below), whose sum is σ = 1773632. Its totient is φ = 886812.

The previous prime is 1330213. The next prime is 1330223. The reversal of 1330221 is 1220331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1330221 - 2³ = 1330213 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1330197 and 1330206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1330223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221701 + ... + 221706.

It is an arithmetic number, because the mean of its divisors is an integer number (443408).

2^1330221 is an apocalyptic number.

It is an amenable number.

1330221 is a deficient number, since it is larger than the sum of its proper divisors (443411).

1330221 is an equidigital number, since it uses as much as digits as its factorization.

1330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443410.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1330221 is about 1153.3520711387. The cubic root of 1330221 is about 109.9785357569.

Adding to 1330221 its reverse (1220331), we get a palindrome (2550552).

It can be divided in two parts, 1330 and 221, that added together give a palindrome (1551).

The spelling of 1330221 in words is "one million, three hundred thirty thousand, two hundred twenty-one".