111331221012 has 96 divisors (see below), whose sum is σ = 331448678400. Its totient is φ = 31961109600.

The previous prime is 111331220983. The next prime is 111331221049. The reversal of 111331221012 is 210122133111.

111331221012 is a `hidden beast` number, since 111 + 331 + 2 + 210 + 12 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2443564 + ... + 2488707.

It is an arithmetic number, because the mean of its divisors is an integer number (3452590400).

Almost surely, 2^111331221012 is an apocalyptic number.

111331221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111331221012 is an abundant number, since it is smaller than the sum of its proper divisors (220117457388).

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

111331221012 is a wasteful number, since it uses less digits than its factorization.

111331221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932314 (or 4932306 counting only the distinct ones).

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

Adding to 111331221012 its reverse (210122133111), we get a palindrome (321453354123).

The spelling of 111331221012 in words is "one hundred eleven billion, three hundred thirty-one million, two hundred twenty-one thousand, twelve".