1221300320323 has 4 divisors (see below), whose sum is σ = 1221902244640. Its totient is φ = 1220698396008.

The previous prime is 1221300320293. The next prime is 1221300320369. The reversal of 1221300320323 is 3230230031221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221300320323 - 2⁵ = 1221300320291 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221300320294 and 1221300320303.

It is not an unprimeable number, because it can be changed into a prime (1221300330323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300959115 + ... + 300963172.

It is an arithmetic number, because the mean of its divisors is an integer number (305475561160).

Almost surely, 2^{1221300320323} is an apocalyptic number.

1221300320323 is a deficient number, since it is larger than the sum of its proper divisors (601924317).

1221300320323 is an equidigital number, since it uses as much as digits as its factorization.

1221300320323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601924316.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 1221300320323 its reverse (3230230031221), we get a palindrome (4451530351544).

The spelling of 1221300320323 in words is "one trillion, two hundred twenty-one billion, three hundred million, three hundred twenty thousand, three hundred twenty-three".