111212121210120 has 192 divisors, whose sum is σ = 414719306951040. Its totient is φ = 25318638720000.

The previous prime is 111212121210089. The next prime is 111212121210121. The reversal of 111212121210120 is 21012121212111.

It is a happy number.

111212121210120 is a `hidden beast` number, since 1 + 1 + 1 + 212 + 121 + 210 + 120 = 666.

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 = 111212121210093 and 111212121210102.

It is not an unprimeable number, because it can be changed into a prime (111212121210121) 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, 87279421 + ... + 88544460.

It is an arithmetic number, because the mean of its divisors is an integer number (2159996390370).

Almost surely, 2^{111212121210120} is an apocalyptic number.

111212121210120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212121210120 is an abundant number, since it is smaller than the sum of its proper divisors (303507185740920).

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

111212121210120 is a wasteful number, since it uses less digits than its factorization.

111212121210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175824156 (or 175824149 counting only the distinct ones).

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

Adding to 111212121210120 its reverse (21012121212111), we get a palindrome (132224242422231).

The spelling of 111212121210120 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty".