9721031020321 has 2 divisors, whose sum is σ = 9721031020322. Its totient is φ = 9721031020320.

The previous prime is 9721031020297. The next prime is 9721031020331. The reversal of 9721031020321 is 1230201301279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9717091700625 + 3939319696 = 3117225^2 + 62764^2 .

It is an emirp because it is prime and its reverse (1230201301279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9721031020321 - 2²⁵ = 9720997465889 is a prime.

It is not a weakly prime, because it can be changed into another prime (9721031020331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860515510160 + 4860515510161.

It is an arithmetic number, because the mean of its divisors is an integer number (4860515510161).

Almost surely, 2^{9721031020321} is an apocalyptic number.

It is an amenable number.

9721031020321 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721031020321 is an equidigital number, since it uses as much as digits as its factorization.

9721031020321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 9721031020321 in words is "nine trillion, seven hundred twenty-one billion, thirty-one million, twenty thousand, three hundred twenty-one".