212123111121 has 40 divisors (see below), whose sum is σ = 317871886464. Its totient is φ = 140971220640.

The previous prime is 212123111117. The next prime is 212123111129. The reversal of 212123111121 is 121111321212.

It is a happy number.

212123111121 is a `hidden beast` number, since 21 + 212 + 311 + 1 + 121 = 666.

212123111121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212123111121 - 2² = 212123111117 is a prime.

It is a super-2 number, since 2×212123111121² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212123111094 and 212123111103.

It is not an unprimeable number, because it can be changed into a prime (212123111129) 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 39 ways as a sum of consecutive naturals, for example, 72718155 + ... + 72721071.

Almost surely, 2^212123111121 is an apocalyptic number.

It is an amenable number.

212123111121 is a deficient number, since it is larger than the sum of its proper divisors (105748775343).

212123111121 is a wasteful number, since it uses less digits than its factorization.

212123111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5443 (or 5434 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 212123111121 its reverse (121111321212), we get a palindrome (333234432333).

The spelling of 212123111121 in words is "two hundred twelve billion, one hundred twenty-three million, one hundred eleven thousand, one hundred twenty-one".