212112112121 has 16 divisors (see below), whose sum is σ = 261849802368. Its totient is φ = 167317920000.

The previous prime is 212112112111. The next prime is 212112112141. The reversal of 212112112121 is 121211211212.

It is not a de Polignac number, because 212112112121 - 2¹⁸ = 212111849977 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212112112121.

It is not an unprimeable number, because it can be changed into a prime (212112112111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3490880 + ... + 3551121.

It is an arithmetic number, because the mean of its divisors is an integer number (16365612648).

Almost surely, 2^212112112121 is an apocalyptic number.

It is an amenable number.

212112112121 is a deficient number, since it is larger than the sum of its proper divisors (49737690247).

212112112121 is a wasteful number, since it uses less digits than its factorization.

212112112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7042352.

The product of its digits is 32, while the sum is 17.

Adding to 212112112121 its reverse (121211211212), we get a palindrome (333323323333).

Subtracting from 212112112121 its reverse (121211211212), we obtain a palindrome (90900900909).

The spelling of 212112112121 in words is "two hundred twelve billion, one hundred twelve million, one hundred twelve thousand, one hundred twenty-one".