13988373521 has 2 divisors, whose sum is σ = 13988373522. Its totient is φ = 13988373520.

The previous prime is 13988373493. The next prime is 13988373527. The reversal of 13988373521 is 12537388931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8083987921 + 5904385600 = 89911^2 + 76840^2 .

It is a cyclic number.

It is not a de Polignac number, because 13988373521 - 2²² = 13984179217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13988373521.

It is not a weakly prime, because it can be changed into another prime (13988373527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6994186760 + 6994186761.

It is an arithmetic number, because the mean of its divisors is an integer number (6994186761).

Almost surely, 2^13988373521 is an apocalyptic number.

It is an amenable number.

13988373521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13988373521 is an equidigital number, since it uses as much as digits as its factorization.

13988373521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The spelling of 13988373521 in words is "thirteen billion, nine hundred eighty-eight million, three hundred seventy-three thousand, five hundred twenty-one".