1320201221 has 4 divisors (see below), whose sum is σ = 1345110732. Its totient is φ = 1295291712.

The previous prime is 1320201217. The next prime is 1320201227. The reversal of 1320201221 is 1221020231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 557668225 + 762532996 = 23615^2 + 27614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320201221 - 2² = 1320201217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320201196 and 1320201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320201227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12454676 + ... + 12454781.

It is an arithmetic number, because the mean of its divisors is an integer number (336277683).

Almost surely, 2^1320201221 is an apocalyptic number.

It is an amenable number.

1320201221 is a deficient number, since it is larger than the sum of its proper divisors (24909511).

1320201221 is an equidigital number, since it uses as much as digits as its factorization.

1320201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24909510.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1320201221 is about 36334.5733565154. The cubic root of 1320201221 is about 1097.0170479705.

Adding to 1320201221 its reverse (1221020231), we get a palindrome (2541221452).

The spelling of 1320201221 in words is "one billion, three hundred twenty million, two hundred one thousand, two hundred twenty-one".