2112212212121 has 8 divisors (see below), whose sum is σ = 2304288019488. Its totient is φ = 1920145824000.

The previous prime is 2112212212073. The next prime is 2112212212129. The reversal of 2112212212121 is 1212122122112.

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

It is a cyclic number.

It is not a de Polignac number, because 2112212212121 - 2⁶ = 2112212212057 is a prime.

It is a super-2 number, since 2×2112212212121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112212212093 and 2112212212102.

It is not an unprimeable number, because it can be changed into a prime (2112212212129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1881800 + ... + 2786681.

It is an arithmetic number, because the mean of its divisors is an integer number (288036002436).

Almost surely, 2^{2112212212121} is an apocalyptic number.

It is an amenable number.

2112212212121 is a deficient number, since it is larger than the sum of its proper divisors (192075807367).

2112212212121 is a wasteful number, since it uses less digits than its factorization.

2112212212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709623.

The product of its digits is 128, while the sum is 20.

Adding to 2112212212121 its reverse (1212122122112), we get a palindrome (3324334334233).

Subtracting from 2112212212121 its reverse (1212122122112), we obtain a palindrome (900090090009).

The spelling of 2112212212121 in words is "two trillion, one hundred twelve billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".