212135123 has 4 divisors (see below), whose sum is σ = 212422920. Its totient is φ = 211847328.

The previous prime is 212135117. The next prime is 212135167. The reversal of 212135123 is 321531212.

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 212135123 - 2¹⁶ = 212069587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212135095 and 212135104.

It is not an unprimeable number, because it can be changed into a prime (212135173) 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, 142790 + ... + 144267.

It is an arithmetic number, because the mean of its divisors is an integer number (53105730).

Almost surely, 2^212135123 is an apocalyptic number.

212135123 is a deficient number, since it is larger than the sum of its proper divisors (287797).

212135123 is an equidigital number, since it uses as much as digits as its factorization.

212135123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287796.

The product of its digits is 360, while the sum is 20.

The square root of 212135123 is about 14564.8591822922. The cubic root of 212135123 is about 596.3998516098.

Adding to 212135123 its reverse (321531212), we get a palindrome (533666335).

The spelling of 212135123 in words is "two hundred twelve million, one hundred thirty-five thousand, one hundred twenty-three".