13111212 has 12 divisors (see below), whose sum is σ = 30592856. Its totient is φ = 4370400.

The previous prime is 13111211. The next prime is 13111229. The reversal of 13111212 is 21211131.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1092601 = 13111212 / (1 + 3 + 1 + 1 + 1 + 2 + 1 + 2).

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 not an unprimeable number, because it can be changed into a prime (13111211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546289 + ... + 546312.

Almost surely, 2^13111212 is an apocalyptic number.

13111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13111212 is an abundant number, since it is smaller than the sum of its proper divisors (17481644).

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

13111212 is a wasteful number, since it uses less digits than its factorization.

13111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092608 (or 1092606 counting only the distinct ones).

The product of its digits is 12, while the sum is 12.

The square root of 13111212 is about 3620.9407617358. The cubic root of 13111212 is about 235.8020699927.

Adding to 13111212 its reverse (21211131), we get a palindrome (34322343).

The spelling of 13111212 in words is "thirteen million, one hundred eleven thousand, two hundred twelve".