13031221231 has 16 divisors (see below), whose sum is σ = 15681116160. Its totient is φ = 10578733920.

The previous prime is 13031221187. The next prime is 13031221267. The reversal of 13031221231 is 13212213031.

It is a cyclic number.

It is not a de Polignac number, because 13031221231 - 2¹¹ = 13031219183 is a prime.

It is a super-2 number, since 2×13031221231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13031221199 and 13031221208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031221831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537021 + ... + 560761.

It is an arithmetic number, because the mean of its divisors is an integer number (980069760).

Almost surely, 2^13031221231 is an apocalyptic number.

13031221231 is a deficient number, since it is larger than the sum of its proper divisors (2649894929).

13031221231 is a wasteful number, since it uses less digits than its factorization.

13031221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27894.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13031221231 its reverse (13212213031), we get a palindrome (26243434262).

The spelling of 13031221231 in words is "thirteen billion, thirty-one million, two hundred twenty-one thousand, two hundred thirty-one".