12112101221 has 8 divisors (see below), whose sum is σ = 13214654688. Its totient is φ = 11009790000.

The previous prime is 12112101191. The next prime is 12112101263. The reversal of 12112101221 is 12210121121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-12112101221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112101196 and 12112101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112101721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53306 + ... + 164516.

It is an arithmetic number, because the mean of its divisors is an integer number (1651831836).

Almost surely, 2^12112101221 is an apocalyptic number.

12112101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12112101221 is a deficient number, since it is larger than the sum of its proper divisors (1102553467).

12112101221 is a wasteful number, since it uses less digits than its factorization.

12112101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121123.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12112101221 its reverse (12210121121), we get a palindrome (24322222342).

The spelling of 12112101221 in words is "twelve billion, one hundred twelve million, one hundred one thousand, two hundred twenty-one".