1221031300321 has 6 divisors (see below), whose sum is σ = 1420383349410. Its totient is φ = 1046598257376.

The previous prime is 1221031300273. The next prime is 1221031300331. The reversal of 1221031300321 is 1230031301221.

It can be written as a sum of positive squares in only one way, i.e., 1076954119696 + 144077180625 = 1037764^2 + 379575^2 .

It is not a de Polignac number, because 1221031300321 - 2⁷ = 1221031300193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221031300331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12459503016 + ... + 12459503113.

It is an arithmetic number, because the mean of its divisors is an integer number (236730558235).

Almost surely, 2^{1221031300321} is an apocalyptic number.

It is an amenable number.

1221031300321 is a deficient number, since it is larger than the sum of its proper divisors (199352049089).

1221031300321 is an equidigital number, since it uses as much as digits as its factorization.

1221031300321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24919006143 (or 24919006136 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1221031300321 its reverse (1230031301221), we get a palindrome (2451062601542).

The spelling of 1221031300321 in words is "one trillion, two hundred twenty-one billion, thirty-one million, three hundred thousand, three hundred twenty-one".