2121221112 has 16 divisors (see below), whose sum is σ = 5303052840. Its totient is φ = 707073696.

The previous prime is 2121221111. The next prime is 2121221129. The reversal of 2121221112 is 2111221212.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 2121221091 and 2121221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44192083 + ... + 44192130.

Almost surely, 2^2121221112 is an apocalyptic number.

It is an amenable number.

2121221112 is an abundant number, since it is smaller than the sum of its proper divisors (3181831728).

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

2121221112 is a wasteful number, since it uses less digits than its factorization.

2121221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88384222 (or 88384218 counting only the distinct ones).

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

The square root of 2121221112 is about 46056.7162528984. The cubic root of 2121221112 is about 1284.8782580340.

Adding to 2121221112 its reverse (2111221212), we get a palindrome (4232442324).

It can be divided in two parts, 21212 and 21112, that added together give a palindrome (42324).

The spelling of 2121221112 in words is "two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twelve".