12000121021 has 6 divisors (see below), whose sum is σ = 13959324510. Its totient is φ = 10285817976.

The previous prime is 12000120931. The next prime is 12000121031. The reversal of 12000121021 is 12012100021.

12000121021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9295080921 + 2705040100 = 96411^2 + 52010^2 .

It is not a de Polignac number, because 12000121021 - 2⁷ = 12000120893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12000120989 and 12000121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000121031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122450166 + ... + 122450263.

It is an arithmetic number, because the mean of its divisors is an integer number (2326554085).

Almost surely, 2^12000121021 is an apocalyptic number.

It is an amenable number.

12000121021 is a deficient number, since it is larger than the sum of its proper divisors (1959203489).

12000121021 is an equidigital number, since it uses as much as digits as its factorization.

12000121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244900443 (or 244900436 counting only the distinct ones).

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

Adding to 12000121021 its reverse (12012100021), we get a palindrome (24012221042).

The spelling of 12000121021 in words is "twelve billion, one hundred twenty-one thousand, twenty-one".