2112221121 has 4 divisors (see below), whose sum is σ = 2816294832. Its totient is φ = 1408147412.

The previous prime is 2112221113. The next prime is 2112221129. The reversal of 2112221121 is 1211222112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2112221113) and next prime (2112221129).

It is a cyclic number.

It is not a de Polignac number, because 2112221121 - 2³ = 2112221113 is a prime.

It is a super-2 number, since 2×2112221121² = 8922956127996993282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2112221121.

It is not an unprimeable number, because it can be changed into a prime (2112221129) 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, 352036851 + ... + 352036856.

It is an arithmetic number, because the mean of its divisors is an integer number (704073708).

Almost surely, 2^2112221121 is an apocalyptic number.

It is an amenable number.

2112221121 is a deficient number, since it is larger than the sum of its proper divisors (704073711).

2112221121 is an equidigital number, since it uses as much as digits as its factorization.

2112221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704073710.

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

The square root of 2112221121 is about 45958.9068734233. The cubic root of 2112221121 is about 1283.0585065215.

Adding to 2112221121 its reverse (1211222112), we get a palindrome (3323443233).

Subtracting from 2112221121 its reverse (1211222112), we obtain a palindrome (900999009).

The spelling of 2112221121 in words is "two billion, one hundred twelve million, two hundred twenty-one thousand, one hundred twenty-one".