13521225313221 has 16 divisors (see below), whose sum is σ = 18611747358720. Its totient is φ = 8722485765360.

The previous prime is 13521225313217. The next prime is 13521225313231. The reversal of 13521225313221 is 12231352212531.

It is not a de Polignac number, because 13521225313221 - 2² = 13521225313217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521225313231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6456555 + ... + 8290328.

It is an arithmetic number, because the mean of its divisors is an integer number (1163234209920).

Almost surely, 2^{13521225313221} is an apocalyptic number.

It is an amenable number.

13521225313221 is a deficient number, since it is larger than the sum of its proper divisors (5090522045499).

13521225313221 is a wasteful number, since it uses less digits than its factorization.

13521225313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14756776.

The product of its digits is 21600, while the sum is 33.

Adding to 13521225313221 its reverse (12231352212531), we get a palindrome (25752577525752).

The spelling of 13521225313221 in words is "thirteen trillion, five hundred twenty-one billion, two hundred twenty-five million, three hundred thirteen thousand, two hundred twenty-one".