1220304321 has 24 divisors (see below), whose sum is σ = 1783926144. Its totient is φ = 803757600.

The previous prime is 1220304301. The next prime is 1220304373. The reversal of 1220304321 is 1234030221.

It is not a de Polignac number, because 1220304321 - 2¹¹ = 1220302273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220304294 and 1220304303.

It is not an unprimeable number, because it can be changed into a prime (1220304301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 532440 + ... + 534726.

It is an arithmetic number, because the mean of its divisors is an integer number (74330256).

Almost surely, 2^1220304321 is an apocalyptic number.

It is an amenable number.

1220304321 is a deficient number, since it is larger than the sum of its proper divisors (563621823).

1220304321 is a wasteful number, since it uses less digits than its factorization.

1220304321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2981 (or 2978 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1220304321 is about 34932.8544639570. The cubic root of 1220304321 is about 1068.6185686740.

Adding to 1220304321 its reverse (1234030221), we get a palindrome (2454334542).

The spelling of 1220304321 in words is "one billion, two hundred twenty million, three hundred four thousand, three hundred twenty-one".