111121212212120 has 48 divisors (see below), whose sum is σ = 274818369883680. Its totient is φ = 40407713529920.

The previous prime is 111121212212117. The next prime is 111121212212141. The reversal of 111121212212120 is 21212212121111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111121212212092 and 111121212212101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11479459232 + ... + 11479468911.

It is an arithmetic number, because the mean of its divisors is an integer number (5725382705910).

Almost surely, 2^{111121212212120} is an apocalyptic number.

111121212212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111121212212120 is an abundant number, since it is smaller than the sum of its proper divisors (163697157671560).

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

111121212212120 is a wasteful number, since it uses less digits than its factorization.

111121212212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22958928176 (or 22958928161 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111121212212120 its reverse (21212212121111), we get a palindrome (132333424333231).

The spelling of 111121212212120 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty".