12121000120 has 128 divisors (see below), whose sum is σ = 28384344000. Its totient is φ = 4655738880.

The previous prime is 12121000117. The next prime is 12121000123. The reversal of 12121000120 is 2100012121.

It is an interprime number because it is at equal distance from previous prime (12121000117) and next prime (12121000123).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12121000097 and 12121000106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121000123) 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, 38725084 + ... + 38725396.

Almost surely, 2^12121000120 is an apocalyptic number.

12121000120 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 12121000120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14192172000).

12121000120 is an abundant number, since it is smaller than the sum of its proper divisors (16263343880).

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

12121000120 is a wasteful number, since it uses less digits than its factorization.

12121000120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713 (or 709 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12121000120 its reverse (2100012121), we get a palindrome (14221012241).

The spelling of 12121000120 in words is "twelve billion, one hundred twenty-one million, one hundred twenty", and thus it is an aban number.