13212111231 has 16 divisors (see below), whose sum is σ = 21352907520. Its totient is φ = 8007339960.

The previous prime is 13212111223. The next prime is 13212111239. The reversal of 13212111231 is 13211121231.

13212111231 is a `hidden beast` number, since 1 + 321 + 2 + 111 + 231 = 666.

13212111231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13212111223) and next prime (13212111239).

It is not a de Polignac number, because 13212111231 - 2³ = 13212111223 is a prime.

It is a super-2 number, since 2×13212111231² (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 (13212111239) 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 15 ways as a sum of consecutive naturals, for example, 22242315 + ... + 22242908.

It is an arithmetic number, because the mean of its divisors is an integer number (1334556720).

Almost surely, 2^13212111231 is an apocalyptic number.

13212111231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13212111231 is a deficient number, since it is larger than the sum of its proper divisors (8140796289).

13212111231 is a wasteful number, since it uses less digits than its factorization.

13212111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44485243 (or 44485237 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 13212111231 its reverse (13211121231), we get a palindrome (26423232462).

The spelling of 13212111231 in words is "thirteen billion, two hundred twelve million, one hundred eleven thousand, two hundred thirty-one".