7138165505321 has 2 divisors, whose sum is σ = 7138165505322. Its totient is φ = 7138165505320.

The previous prime is 7138165505297. The next prime is 7138165505347. The reversal of 7138165505321 is 1235055618317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5605818610921 + 1532346894400 = 2367661^2 + 1237880^2 .

It is a cyclic number.

It is not a de Polignac number, because 7138165505321 - 2³⁴ = 7120985636137 is a prime.

It is not a weakly prime, because it can be changed into another prime (7138165505021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3569082752660 + 3569082752661.

It is an arithmetic number, because the mean of its divisors is an integer number (3569082752661).

Almost surely, 2^{7138165505321} is an apocalyptic number.

It is an amenable number.

7138165505321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7138165505321 is an equidigital number, since it uses as much as digits as its factorization.

7138165505321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 7138165505321 in words is "seven trillion, one hundred thirty-eight billion, one hundred sixty-five million, five hundred five thousand, three hundred twenty-one".