212113123 has 4 divisors (see below), whose sum is σ = 213464320. Its totient is φ = 210761928.

The previous prime is 212113117. The next prime is 212113141. The reversal of 212113123 is 321311212.

212113123 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 212113123 - 2²⁵ = 178558691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212113097 and 212113106.

It is not an unprimeable number, because it can be changed into a prime (212113523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675363 + ... + 675676.

It is an arithmetic number, because the mean of its divisors is an integer number (53366080).

Almost surely, 2^212113123 is an apocalyptic number.

212113123 is a deficient number, since it is larger than the sum of its proper divisors (1351197).

212113123 is a wasteful number, since it uses less digits than its factorization.

212113123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351196.

The product of its digits is 72, while the sum is 16.

The square root of 212113123 is about 14564.1039202554. The cubic root of 212113123 is about 596.3792338542.

Adding to 212113123 its reverse (321311212), we get a palindrome (533424335).

The spelling of 212113123 in words is "two hundred twelve million, one hundred thirteen thousand, one hundred twenty-three".