212142403423 has 4 divisors (see below), whose sum is σ = 212567539000. Its totient is φ = 211717267848.

The previous prime is 212142403409. The next prime is 212142403471. The reversal of 212142403423 is 324304241212.

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 212142403423 - 2⁹ = 212142402911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212142403391 and 212142403400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212142803423) 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, 212567040 + ... + 212568037.

It is an arithmetic number, because the mean of its divisors is an integer number (53141884750).

Almost surely, 2^212142403423 is an apocalyptic number.

212142403423 is a deficient number, since it is larger than the sum of its proper divisors (425135577).

212142403423 is an equidigital number, since it uses as much as digits as its factorization.

212142403423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425135576.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 212142403423 its reverse (324304241212), we get a palindrome (536446644635).

The spelling of 212142403423 in words is "two hundred twelve billion, one hundred forty-two million, four hundred three thousand, four hundred twenty-three".