13851988830721 has 2 divisors, whose sum is σ = 13851988830722. Its totient is φ = 13851988830720.

The previous prime is 13851988830703. The next prime is 13851988830731. The reversal of 13851988830721 is 12703888915831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13700095460496 + 151893370225 = 3701364^2 + 389735^2 .

It is an emirp because it is prime and its reverse (12703888915831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13851988830721 - 2¹¹ = 13851988828673 is a prime.

It is not a weakly prime, because it can be changed into another prime (13851988830731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6925994415360 + 6925994415361.

It is an arithmetic number, because the mean of its divisors is an integer number (6925994415361).

Almost surely, 2^{13851988830721} is an apocalyptic number.

It is an amenable number.

13851988830721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13851988830721 is an equidigital number, since it uses as much as digits as its factorization.

13851988830721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23224320, while the sum is 64.

The spelling of 13851988830721 in words is "thirteen trillion, eight hundred fifty-one billion, nine hundred eighty-eight million, eight hundred thirty thousand, seven hundred twenty-one".