2112212121 has 8 divisors (see below), whose sum is σ = 2964508320. Its totient is φ = 1334028672.

The previous prime is 2112212119. The next prime is 2112212131. The reversal of 2112212121 is 1212122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2112212121 - 2¹ = 2112212119 is a prime.

It is a super-2 number, since 2×2112212121² = 8922880088198637282, 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 2112212121.

It is not an unprimeable number, because it can be changed into a prime (2112212131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18528120 + ... + 18528233.

It is an arithmetic number, because the mean of its divisors is an integer number (370563540).

Almost surely, 2^2112212121 is an apocalyptic number.

It is an amenable number.

2112212121 is a deficient number, since it is larger than the sum of its proper divisors (852296199).

2112212121 is a wasteful number, since it uses less digits than its factorization.

2112212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37056375.

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

The square root of 2112212121 is about 45958.8089597631. The cubic root of 2112212121 is about 1283.0566841835.

Adding to 2112212121 its reverse (1212122112), we get a palindrome (3324334233).

Subtracting from 2112212121 its reverse (1212122112), we obtain a palindrome (900090009).

The spelling of 2112212121 in words is "two billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".