12101121021 has 16 divisors (see below), whose sum is σ = 17668569600. Its totient is φ = 7306121520.

The previous prime is 12101121007. The next prime is 12101121047. The reversal of 12101121021 is 12012110121.

It is not a de Polignac number, because 12101121021 - 2¹⁰ = 12101119997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12101120988 and 12101121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 688471 + ... + 705828.

It is an arithmetic number, because the mean of its divisors is an integer number (1104285600).

Almost surely, 2^12101121021 is an apocalyptic number.

12101121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12101121021 is a deficient number, since it is larger than the sum of its proper divisors (5567448579).

12101121021 is a wasteful number, since it uses less digits than its factorization.

12101121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394576.

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

Adding to 12101121021 its reverse (12012110121), we get a palindrome (24113231142).

The spelling of 12101121021 in words is "twelve billion, one hundred one million, one hundred twenty-one thousand, twenty-one".