7987927426321 has 2 divisors, whose sum is σ = 7987927426322. Its totient is φ = 7987927426320.

The previous prime is 7987927426273. The next prime is 7987927426333. The reversal of 7987927426321 is 1236247297897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4305708000400 + 3682219425921 = 2075020^2 + 1918911^2 .

It is an emirp because it is prime and its reverse (1236247297897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7987927426321 - 2⁹ = 7987927425809 is a prime.

It is not a weakly prime, because it can be changed into another prime (7987927426361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3993963713160 + 3993963713161.

It is an arithmetic number, because the mean of its divisors is an integer number (3993963713161).

Almost surely, 2^{7987927426321} is an apocalyptic number.

It is an amenable number.

7987927426321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987927426321 is an equidigital number, since it uses as much as digits as its factorization.

7987927426321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128024064, while the sum is 67.

The spelling of 7987927426321 in words is "seven trillion, nine hundred eighty-seven billion, nine hundred twenty-seven million, four hundred twenty-six thousand, three hundred twenty-one".