12100121221 has 16 divisors (see below), whose sum is σ = 13059809280. Its totient is φ = 11178074160.

The previous prime is 12100121213. The next prime is 12100121237. The reversal of 12100121221 is 12212100121.

It is a cyclic number.

It is not a de Polignac number, because 12100121221 - 2³ = 12100121213 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 (12100131221) 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, 341770 + ... + 375508.

It is an arithmetic number, because the mean of its divisors is an integer number (816238080).

Almost surely, 2^12100121221 is an apocalyptic number.

It is an amenable number.

12100121221 is a deficient number, since it is larger than the sum of its proper divisors (959688059).

12100121221 is a wasteful number, since it uses less digits than its factorization.

12100121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34296.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12100121221 its reverse (12212100121), we get a palindrome (24312221342).

The spelling of 12100121221 in words is "twelve billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".