1331021030321 has 2 divisors, whose sum is σ = 1331021030322. Its totient is φ = 1331021030320.

The previous prime is 1331021030299. The next prime is 1331021030369. The reversal of 1331021030321 is 1230301201331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1314267352225 + 16753678096 = 1146415^2 + 129436^2 .

It is an emirp because it is prime and its reverse (1230301201331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331021030321 - 2¹⁸ = 1331020768177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1331021030293 and 1331021030302.

It is not a weakly prime, because it can be changed into another prime (1331021030371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665510515160 + 665510515161.

It is an arithmetic number, because the mean of its divisors is an integer number (665510515161).

Almost surely, 2^{1331021030321} is an apocalyptic number.

It is an amenable number.

1331021030321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331021030321 is an equidigital number, since it uses as much as digits as its factorization.

1331021030321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 1331021030321 its reverse (1230301201331), we get a palindrome (2561322231652).

The spelling of 1331021030321 in words is "one trillion, three hundred thirty-one billion, twenty-one million, thirty thousand, three hundred twenty-one".