111212331012 has 144 divisors (see below), whose sum is σ = 291276690432. Its totient is φ = 35750626560.

The previous prime is 111212331011. The next prime is 111212331031. The reversal of 111212331012 is 210133212111.

111212331012 is a `hidden beast` number, since 111 + 212 + 331 + 0 + 12 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (111212331011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112221837 + ... + 112222827.

Almost surely, 2^111212331012 is an apocalyptic number.

111212331012 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 111212331012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145638345216).

111212331012 is an abundant number, since it is smaller than the sum of its proper divisors (180064359420).

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

111212331012 is a wasteful number, since it uses less digits than its factorization.

111212331012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698 (or 1693 counting only the distinct ones).

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

Adding to 111212331012 its reverse (210133212111), we get a palindrome (321345543123).

The spelling of 111212331012 in words is "one hundred eleven billion, two hundred twelve million, three hundred thirty-one thousand, twelve".