12121111012120 has 128 divisors (see below), whose sum is σ = 30055777678080. Its totient is φ = 4362672960000.

The previous prime is 12121111012103. The next prime is 12121111012123. The reversal of 12121111012120 is 2121011112121.

It is a junction number, because it is equal to n+sod(n) for n = 12121111012094 and 12121111012103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121111012123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147988699 + ... + 148070581.

It is an arithmetic number, because the mean of its divisors is an integer number (234810763110).

Almost surely, 2^{12121111012120} is an apocalyptic number.

12121111012120 is a gapful number since it is divisible by the number (10) 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 12121111012120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15027888839040).

12121111012120 is an abundant number, since it is smaller than the sum of its proper divisors (17934666665960).

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

12121111012120 is a wasteful number, since it uses less digits than its factorization.

12121111012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85337 (or 85333 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 12121111012120 its reverse (2121011112121), we get a palindrome (14242122124241).

The spelling of 12121111012120 in words is "twelve trillion, one hundred twenty-one billion, one hundred eleven million, twelve thousand, one hundred twenty".