13531111221 has 8 divisors (see below), whose sum is σ = 18042112800. Its totient is φ = 9020425232.

The previous prime is 13531111213. The next prime is 13531111277. The reversal of 13531111221 is 12211113531.

13531111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13531111221 - 2³ = 13531111213 is a prime.

It is a super-2 number, since 2×13531111221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531118221) 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 in 7 ways as a sum of consecutive naturals, for example, 52330 + ... + 172628.

It is an arithmetic number, because the mean of its divisors is an integer number (2255264100).

Almost surely, 2^13531111221 is an apocalyptic number.

It is an amenable number.

13531111221 is a deficient number, since it is larger than the sum of its proper divisors (4511001579).

13531111221 is a wasteful number, since it uses less digits than its factorization.

13531111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157795.

The product of its digits is 180, while the sum is 21.

Adding to 13531111221 its reverse (12211113531), we get a palindrome (25742224752).

The spelling of 13531111221 in words is "thirteen billion, five hundred thirty-one million, one hundred eleven thousand, two hundred twenty-one".