2112212121111 has 12 divisors (see below), whose sum is σ = 3051014862480. Its totient is φ = 1408122122400.

The previous prime is 2112212121067. The next prime is 2112212121113. The reversal of 2112212121111 is 1111212122112.

It is a happy number.

2112212121111 is a `hidden beast` number, since 211 + 221 + 2 + 121 + 111 = 666.

It is not a de Polignac number, because 2112212121111 - 2¹⁹ = 2112211596823 is a prime.

It is a super-2 number, since 2×2112212121111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112212121113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897715 + ... + 2242836.

It is an arithmetic number, because the mean of its divisors is an integer number (254251238540).

Almost surely, 2^{2112212121111} is an apocalyptic number.

2112212121111 is a deficient number, since it is larger than the sum of its proper divisors (938802741369).

2112212121111 is a wasteful number, since it uses less digits than its factorization.

2112212121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215286 (or 3215283 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 2112212121111 its reverse (1111212122112), we get a palindrome (3223424243223).

It can be divided in two parts, 211221 and 2121111, that added together give a palindrome (2332332).

The spelling of 2112212121111 in words is "two trillion, one hundred twelve billion, two hundred twelve million, one hundred twenty-one thousand, one hundred eleven".