2121213312112 has 80 divisors (see below), whose sum is σ = 4329949865472. Its totient is φ = 1004739690240.

The previous prime is 2121213312109. The next prime is 2121213312167. The reversal of 2121213312112 is 2112133121212.

It is a happy number.

It is a super-2 number, since 2×2121213312112² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17677437 + ... + 17797027.

Almost surely, 2^{2121213312112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121213312112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2164974932736).

2121213312112 is an abundant number, since it is smaller than the sum of its proper divisors (2208736553360).

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

2121213312112 is a wasteful number, since it uses less digits than its factorization.

2121213312112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120086 (or 120080 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

Adding to 2121213312112 its reverse (2112133121212), we get a palindrome (4233346433324).

The spelling of 2121213312112 in words is "two trillion, one hundred twenty-one billion, two hundred thirteen million, three hundred twelve thousand, one hundred twelve".