111122121210012 has 144 divisors (see below), whose sum is σ = 308780618065920. Its totient is φ = 33414827097600.

The previous prime is 111122121209963. The next prime is 111122121210041. The reversal of 111122121210012 is 210012121221111.

It is a happy number.

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 47 ways as a sum of consecutive naturals, for example, 1845147333 + ... + 1845207555.

It is an arithmetic number, because the mean of its divisors is an integer number (2144309847680).

Almost surely, 2^{111122121210012} is an apocalyptic number.

111122121210012 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 111122121210012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154390309032960).

111122121210012 is an abundant number, since it is smaller than the sum of its proper divisors (197658496855908).

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

111122121210012 is a wasteful number, since it uses less digits than its factorization.

111122121210012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95944 (or 95939 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111122121210012 its reverse (210012121221111), we get a palindrome (321134242431123).

The spelling of 111122121210012 in words is "one hundred eleven trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred ten thousand, twelve".