13405502129221 has 2 divisors, whose sum is σ = 13405502129222. Its totient is φ = 13405502129220.

The previous prime is 13405502129191. The next prime is 13405502129231. The reversal of 13405502129221 is 12292120550431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11259306429121 + 2146195700100 = 3355489^2 + 1464990^2 .

It is a cyclic number.

It is not a de Polignac number, because 13405502129221 - 2³¹ = 13403354645573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13405502129231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6702751064610 + 6702751064611.

It is an arithmetic number, because the mean of its divisors is an integer number (6702751064611).

Almost surely, 2^{13405502129221} is an apocalyptic number.

It is an amenable number.

13405502129221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13405502129221 is an equidigital number, since it uses as much as digits as its factorization.

13405502129221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 13405502129221 its reverse (12292120550431), we get a palindrome (25697622679652).

The spelling of 13405502129221 in words is "thirteen trillion, four hundred five billion, five hundred two million, one hundred twenty-nine thousand, two hundred twenty-one".