12100212122221 has 16 divisors (see below), whose sum is σ = 12718908918144. Its totient is φ = 11489488902144.

The previous prime is 12100212122213. The next prime is 12100212122233. The reversal of 12100212122221 is 12222121200121.

It is a cyclic number.

It is not a de Polignac number, because 12100212122221 - 2³ = 12100212122213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100212122321) 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, 845496 + ... + 4991521.

It is an arithmetic number, because the mean of its divisors is an integer number (794931807384).

Almost surely, 2^{12100212122221} is an apocalyptic number.

It is an amenable number.

12100212122221 is a deficient number, since it is larger than the sum of its proper divisors (618696795923).

12100212122221 is a wasteful number, since it uses less digits than its factorization.

12100212122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5837700.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12100212122221 its reverse (12222121200121), we get a palindrome (24322333322342).

The spelling of 12100212122221 in words is "twelve trillion, one hundred billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".