1302220321 has 12 divisors (see below), whose sum is σ = 1362671100. Its totient is φ = 1242969728.

The previous prime is 1302220307. The next prime is 1302220327. The reversal of 1302220321 is 1230222031.

It can be written as a sum of positive squares in 6 ways, for example, as 252460321 + 1049760000 = 15889^2 + 32400^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1302220321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1302220295 and 1302220304.

It is not an unprimeable number, because it can be changed into a prime (1302220327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226875 + ... + 232543.

It is an arithmetic number, because the mean of its divisors is an integer number (113555925).

Almost surely, 2^1302220321 is an apocalyptic number.

It is an amenable number.

1302220321 is a deficient number, since it is larger than the sum of its proper divisors (60450779).

1302220321 is an frugal number, since it uses more digits than its factorization.

1302220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876 (or 5787 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1302220321 is about 36086.2899312190. The cubic root of 1302220321 is about 1092.0138738974.

Adding to 1302220321 its reverse (1230222031), we get a palindrome (2532442352).

The spelling of 1302220321 in words is "one billion, three hundred two million, two hundred twenty thousand, three hundred twenty-one".