13113121212 has 48 divisors (see below), whose sum is σ = 34008871680. Its totient is φ = 4369511664.

The previous prime is 13113121211. The next prime is 13113121223. The reversal of 13113121212 is 21212131131.

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.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13113121211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313273 + ... + 352655.

It is an arithmetic number, because the mean of its divisors is an integer number (708518160).

Almost surely, 2^13113121212 is an apocalyptic number.

13113121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13113121212 is an abundant number, since it is smaller than the sum of its proper divisors (20895750468).

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

13113121212 is a wasteful number, since it uses less digits than its factorization.

13113121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42479 (or 42471 counting only the distinct ones).

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

Adding to 13113121212 its reverse (21212131131), we get a palindrome (34325252343).

The spelling of 13113121212 in words is "thirteen billion, one hundred thirteen million, one hundred twenty-one thousand, two hundred twelve".