12112021212 has 72 divisors (see below), whose sum is σ = 30470275584. Its totient is φ = 3743063808.

The previous prime is 12112021189. The next prime is 12112021231. The reversal of 12112021212 is 21212021121.

It is a junction number, because it is equal to n+sod(n) for n = 12112021191 and 12112021200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206293 + ... + 258419.

It is an arithmetic number, because the mean of its divisors is an integer number (423198272).

Almost surely, 2^12112021212 is an apocalyptic number.

12112021212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12112021212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15235137792).

12112021212 is an abundant number, since it is smaller than the sum of its proper divisors (18358254372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12112021212 is a wasteful number, since it uses less digits than its factorization.

12112021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52235 (or 52216 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12112021212 its reverse (21212021121), we get a palindrome (33324042333).

Subtracting 12112021212 from its reverse (21212021121), we obtain a palindrome (9099999909).

The spelling of 12112021212 in words is "twelve billion, one hundred twelve million, twenty-one thousand, two hundred twelve".