13502555221 has 2 divisors, whose sum is σ = 13502555222. Its totient is φ = 13502555220.

The previous prime is 13502555203. The next prime is 13502555239. The reversal of 13502555221 is 12255520531.

It is a balanced prime because it is at equal distance from previous prime (13502555203) and next prime (13502555239).

It can be written as a sum of positive squares in only one way, i.e., 13430492100 + 72063121 = 115890^2 + 8489^2 .

It is an emirp because it is prime and its reverse (12255520531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13502555221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13502555251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6751277610 + 6751277611.

It is an arithmetic number, because the mean of its divisors is an integer number (6751277611).

Almost surely, 2^13502555221 is an apocalyptic number.

It is an amenable number.

13502555221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13502555221 is an equidigital number, since it uses as much as digits as its factorization.

13502555221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 13502555221 in words is "thirteen billion, five hundred two million, five hundred fifty-five thousand, two hundred twenty-one".