212123101123 has 4 divisors (see below), whose sum is σ = 214105560120. Its totient is φ = 210140642128.

The previous prime is 212123101051. The next prime is 212123101129. The reversal of 212123101123 is 321101321212.

212123101123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212123101123 - 2³³ = 203533166531 is a prime.

It is a super-2 number, since 2×212123101123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212123101123.

It is not an unprimeable number, because it can be changed into a prime (212123101129) 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 3 ways as a sum of consecutive naturals, for example, 991229338 + ... + 991229551.

It is an arithmetic number, because the mean of its divisors is an integer number (53526390030).

Almost surely, 2^212123101123 is an apocalyptic number.

212123101123 is a deficient number, since it is larger than the sum of its proper divisors (1982458997).

212123101123 is a wasteful number, since it uses less digits than its factorization.

212123101123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982458996.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 212123101123 its reverse (321101321212), we get a palindrome (533224422335).

The spelling of 212123101123 in words is "two hundred twelve billion, one hundred twenty-three million, one hundred one thousand, one hundred twenty-three".