13888806521 has 2 divisors, whose sum is σ = 13888806522. Its totient is φ = 13888806520.

The previous prime is 13888806499. The next prime is 13888806553. The reversal of 13888806521 is 12560888831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13652754025 + 236052496 = 116845^2 + 15364^2 .

It is a cyclic number.

It is not a de Polignac number, because 13888806521 - 2¹⁸ = 13888544377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13888806521.

It is not a weakly prime, because it can be changed into another prime (13888806571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6944403260 + 6944403261.

It is an arithmetic number, because the mean of its divisors is an integer number (6944403261).

Almost surely, 2^13888806521 is an apocalyptic number.

It is an amenable number.

13888806521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13888806521 is an equidigital number, since it uses as much as digits as its factorization.

13888806521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 737280, while the sum is 50.

The spelling of 13888806521 in words is "thirteen billion, eight hundred eighty-eight million, eight hundred six thousand, five hundred twenty-one".