12102100121221 has 16 divisors (see below), whose sum is σ = 14345443584000. Its totient is φ = 10086640009200.

The previous prime is 12102100121219. The next prime is 12102100121239. The reversal of 12102100121221 is 12212100120121.

It is a cyclic number.

It is not a de Polignac number, because 12102100121221 - 2¹ = 12102100121219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102100121195 and 12102100121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102100121921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 933941671 + ... + 933954628.

It is an arithmetic number, because the mean of its divisors is an integer number (896590224000).

Almost surely, 2^{12102100121221} is an apocalyptic number.

12102100121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12102100121221 is a deficient number, since it is larger than the sum of its proper divisors (2243343462779).

12102100121221 is a wasteful number, since it uses less digits than its factorization.

12102100121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867896360.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12102100121221 its reverse (12212100120121), we get a palindrome (24314200241342).

The spelling of 12102100121221 in words is "twelve trillion, one hundred two billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".