1220320001321 has 8 divisors (see below), whose sum is σ = 1252449848160. Its totient is φ = 1188599452128.

The previous prime is 1220320001317. The next prime is 1220320001333. The reversal of 1220320001321 is 1231000230221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220320001321 - 2² = 1220320001317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220320001321.

It is not an unprimeable number, because it can be changed into a prime (1220320001371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102318371 + ... + 102330296.

It is an arithmetic number, because the mean of its divisors is an integer number (156556231020).

Almost surely, 2^{1220320001321} is an apocalyptic number.

It is an amenable number.

1220320001321 is a deficient number, since it is larger than the sum of its proper divisors (32129846839).

1220320001321 is an equidigital number, since it uses as much as digits as its factorization.

1220320001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204648823.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1220320001321 its reverse (1231000230221), we get a palindrome (2451320231542).

The spelling of 1220320001321 in words is "one trillion, two hundred twenty billion, three hundred twenty million, one thousand, three hundred twenty-one".