1303221321 has 6 divisors (see below), whose sum is σ = 1882430810. Its totient is φ = 868814208.

The previous prime is 1303221247. The next prime is 1303221329. The reversal of 1303221321 is 1231223031.

It can be written as a sum of positive squares in only one way, i.e., 1282427721 + 20793600 = 35811^2 + 4560^2 .

It is not a de Polignac number, because 1303221321 - 2¹⁰ = 1303220297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1303221294 and 1303221303.

It is not an unprimeable number, because it can be changed into a prime (1303221329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72401176 + ... + 72401193.

Almost surely, 2^1303221321 is an apocalyptic number.

It is an amenable number.

1303221321 is a deficient number, since it is larger than the sum of its proper divisors (579209489).

1303221321 is a wasteful number, since it uses less digits than its factorization.

1303221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144802375 (or 144802372 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1303221321 is about 36100.1568002135. The cubic root of 1303221321 is about 1092.2936079035.

Adding to 1303221321 its reverse (1231223031), we get a palindrome (2534444352).

The spelling of 1303221321 in words is "one billion, three hundred three million, two hundred twenty-one thousand, three hundred twenty-one".