13121231112 has 96 divisors (see below), whose sum is σ = 39313460160. Its totient is φ = 3920112000.

The previous prime is 13121231099. The next prime is 13121231141. The reversal of 13121231112 is 21113212131.

13121231112 is a `hidden beast` number, since 131 + 212 + 311 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60439 + ... + 172902.

It is an arithmetic number, because the mean of its divisors is an integer number (409515210).

Almost surely, 2^13121231112 is an apocalyptic number.

13121231112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13121231112 is an abundant number, since it is smaller than the sum of its proper divisors (26192229048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13121231112 is a wasteful number, since it uses less digits than its factorization.

13121231112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233435 (or 233428 counting only the distinct ones).

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

Adding to 13121231112 its reverse (21113212131), we get a palindrome (34234443243).

The spelling of 13121231112 in words is "thirteen billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred twelve".