12000121000 has 128 divisors (see below), whose sum is σ = 32307125760. Its totient is φ = 4086720000.

The previous prime is 12000120931. The next prime is 12000121031. The reversal of 12000121000 is 12100021.

It is a super-3 number, since 3×12000121000³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1051324 + ... + 1062676.

It is an arithmetic number, because the mean of its divisors is an integer number (252399420).

Almost surely, 2^12000121000 is an apocalyptic number.

12000121000 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 12000121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16153562880).

12000121000 is an abundant number, since it is smaller than the sum of its proper divisors (20307004760).

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

12000121000 is a wasteful number, since it uses less digits than its factorization.

12000121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11532 (or 11518 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 12000121000 its reverse (12100021), we get a palindrome (12012221021).

The spelling of 12000121000 in words is "twelve billion, one hundred twenty-one thousand".