2121210112 has 72 divisors (see below), whose sum is σ = 4957206912. Its totient is φ = 886886400.

The previous prime is 2121210107. The next prime is 2121210127. The reversal of 2121210112 is 2110121212.

It is a super-3 number, since 3×2121210112³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121210092 and 2121210101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59037 + ... + 87907.

It is an arithmetic number, because the mean of its divisors is an integer number (68850096).

Almost surely, 2^2121210112 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 2121210112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2478603456).

2121210112 is an abundant number, since it is smaller than the sum of its proper divisors (2835996800).

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

2121210112 is an equidigital number, since it uses as much as digits as its factorization.

2121210112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28935 (or 28921 counting only the distinct ones).

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

The square root of 2121210112 is about 46056.5968347641. The cubic root of 2121210112 is about 1284.8760370357.

Adding to 2121210112 its reverse (2110121212), we get a palindrome (4231331324).

Subtracting from 2121210112 its reverse (2110121212), we obtain a square (11088900 = 3330²).

The spelling of 2121210112 in words is "two billion, one hundred twenty-one million, two hundred ten thousand, one hundred twelve".