11321131212 has 120 divisors (see below), whose sum is σ = 29910646304. Its totient is φ = 3733786368.

The previous prime is 11321131207. The next prime is 11321131253. The reversal of 11321131212 is 21213112311.

11321131212 is a `hidden beast` number, since 1 + 1 + 321 + 131 + 212 = 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.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23246433 + ... + 23246919.

Almost surely, 2^11321131212 is an apocalyptic number.

11321131212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11321131212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14955323152).

11321131212 is an abundant number, since it is smaller than the sum of its proper divisors (18589515092).

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

11321131212 is a wasteful number, since it uses less digits than its factorization.

11321131212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117 (or 1106 counting only the distinct ones).

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

Adding to 11321131212 its reverse (21213112311), we get a palindrome (32534243523).

The spelling of 11321131212 in words is "eleven billion, three hundred twenty-one million, one hundred thirty-one thousand, two hundred twelve".