111212131320 has 192 divisors, whose sum is σ = 381859920000. Its totient is φ = 28024571904.

The previous prime is 111212131297. The next prime is 111212131321. The reversal of 111212131320 is 23131212111.

111212131320 is a `hidden beast` number, since 1 + 1 + 1 + 212 + 131 + 320 = 666.

111212131320 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 111212131293 and 111212131302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212131321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 377356 + ... + 604004.

It is an arithmetic number, because the mean of its divisors is an integer number (1988853750).

Almost surely, 2^111212131320 is an apocalyptic number.

111212131320 is a gapful number since it is divisible by the number (10) 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 111212131320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190929960000).

111212131320 is an abundant number, since it is smaller than the sum of its proper divisors (270647788680).

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

111212131320 is a wasteful number, since it uses less digits than its factorization.

111212131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226742 (or 226735 counting only the distinct ones).

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

Adding to 111212131320 its reverse (23131212111), we get a palindrome (134343343431).

The spelling of 111212131320 in words is "one hundred eleven billion, two hundred twelve million, one hundred thirty-one thousand, three hundred twenty".