12112121101221 has 16 divisors (see below), whose sum is σ = 18888298014400. Its totient is φ = 7649760695184.

The previous prime is 12112121101139. The next prime is 12112121101231. The reversal of 12112121101221 is 12210112121121.

It is a happy number.

12112121101221 is a `hidden beast` number, since 1 + 211 + 21 + 211 + 0 + 1 + 221 = 666.

It is not a de Polignac number, because 12112121101221 - 2¹⁷ = 12112120970149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112121101194 and 12112121101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112121101231) 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, 11805185746 + ... + 11805186771.

It is an arithmetic number, because the mean of its divisors is an integer number (1180518625900).

Almost surely, 2^{12112121101221} is an apocalyptic number.

It is an amenable number.

12112121101221 is a deficient number, since it is larger than the sum of its proper divisors (6776176913179).

12112121101221 is a wasteful number, since it uses less digits than its factorization.

12112121101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23610372545 (or 23610372539 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12112121101221 its reverse (12210112121121), we get a palindrome (24322233222342).

The spelling of 12112121101221 in words is "twelve trillion, one hundred twelve billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".