13521344221 has 32 divisors (see below), whose sum is σ = 17602375680. Its totient is φ = 10077547200.

The previous prime is 13521344149. The next prime is 13521344233. The reversal of 13521344221 is 12244312531.

It is not a de Polignac number, because 13521344221 - 2⁹ = 13521343709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13521344221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521344251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210636 + ... + 267226.

It is an arithmetic number, because the mean of its divisors is an integer number (550074240).

Almost surely, 2^13521344221 is an apocalyptic number.

13521344221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13521344221 is a deficient number, since it is larger than the sum of its proper divisors (4081031459).

13521344221 is a wasteful number, since it uses less digits than its factorization.

13521344221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56745.

The product of its digits is 5760, while the sum is 28.

Adding to 13521344221 its reverse (12244312531), we get a palindrome (25765656752).

The spelling of 13521344221 in words is "thirteen billion, five hundred twenty-one million, three hundred forty-four thousand, two hundred twenty-one".