13131001221 has 8 divisors (see below), whose sum is σ = 18854771040. Its totient is φ = 8080616112.

The previous prime is 13131001211. The next prime is 13131001309. The reversal of 13131001221 is 12210013131.

It is a happy number.

13131001221 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 not a de Polignac number, because 13131001221 - 2⁶ = 13131001157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13131001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131001211) 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, 168346131 + ... + 168346208.

It is an arithmetic number, because the mean of its divisors is an integer number (2356846380).

Almost surely, 2^13131001221 is an apocalyptic number.

It is an amenable number.

13131001221 is a deficient number, since it is larger than the sum of its proper divisors (5723769819).

13131001221 is a wasteful number, since it uses less digits than its factorization.

13131001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336692355.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 13131001221 its reverse (12210013131), we get a palindrome (25341014352).

The spelling of 13131001221 in words is "thirteen billion, one hundred thirty-one million, one thousand, two hundred twenty-one".