1220302321 has 12 divisors (see below), whose sum is σ = 1465328640. Its totient is φ = 1012231080.

The previous prime is 1220302309. The next prime is 1220302331. The reversal of 1220302321 is 1232030221.

It is not a de Polignac number, because 1220302321 - 2²¹ = 1218205169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220302295 and 1220302304.

It is not an unprimeable number, because it can be changed into a prime (1220302331) 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, 400161 + ... + 403198.

It is an arithmetic number, because the mean of its divisors is an integer number (122110720).

Almost surely, 2^1220302321 is an apocalyptic number.

It is an amenable number.

1220302321 is a deficient number, since it is larger than the sum of its proper divisors (245026319).

1220302321 is an equidigital number, since it uses as much as digits as its factorization.

1220302321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803404 (or 803397 counting only the distinct ones).

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

The square root of 1220302321 is about 34932.8258375987. The cubic root of 1220302321 is about 1068.6179848748.

Adding to 1220302321 its reverse (1232030221), we get a palindrome (2452332542).

The spelling of 1220302321 in words is "one billion, two hundred twenty million, three hundred two thousand, three hundred twenty-one".