1320221 has 4 divisors (see below), whose sum is σ = 1508832. Its totient is φ = 1131612.

The previous prime is 1320211. The next prime is 1320247. The reversal of 1320221 is 1220231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1220231 = 151 ⋅8081.

It is a cyclic number.

It is not a de Polignac number, because 1320221 - 2⁶ = 1320157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320211) 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, 94295 + ... + 94308.

It is an arithmetic number, because the mean of its divisors is an integer number (377208).

2^1320221 is an apocalyptic number.

It is an amenable number.

1320221 is a deficient number, since it is larger than the sum of its proper divisors (188611).

1320221 is an equidigital number, since it uses as much as digits as its factorization.

1320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188610.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1320221 is about 1149.0087031872. The cubic root of 1320221 is about 109.7022526376.

Adding to 1320221 its reverse (1220231), we get a palindrome (2540452).

The spelling of 1320221 in words is "one million, three hundred twenty thousand, two hundred twenty-one".