12121110021 has 8 divisors (see below), whose sum is σ = 17012084320. Its totient is φ = 7655437872.

The previous prime is 12121109951. The next prime is 12121110061. The reversal of 12121110021 is 12001112121.

12121110021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12121110021 - 2⁷ = 12121109893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121109979 and 12121110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121110061) 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 7 ways as a sum of consecutive naturals, for example, 106325470 + ... + 106325583.

It is an arithmetic number, because the mean of its divisors is an integer number (2126510540).

Almost surely, 2^12121110021 is an apocalyptic number.

It is an amenable number.

12121110021 is a deficient number, since it is larger than the sum of its proper divisors (4890974299).

12121110021 is a wasteful number, since it uses less digits than its factorization.

12121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212651075.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12121110021 its reverse (12001112121), we get a palindrome (24122222142).

The spelling of 12121110021 in words is "twelve billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".