212142243 has 4 divisors (see below), whose sum is σ = 282856328. Its totient is φ = 141428160.

The previous prime is 212142223. The next prime is 212142247. The reversal of 212142243 is 342241212.

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

It is not a de Polignac number, because 212142243 - 2⁵ = 212142211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212142247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35357038 + ... + 35357043.

It is an arithmetic number, because the mean of its divisors is an integer number (70714082).

Almost surely, 2^212142243 is an apocalyptic number.

212142243 is a deficient number, since it is larger than the sum of its proper divisors (70714085).

212142243 is an equidigital number, since it uses as much as digits as its factorization.

212142243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70714084.

The product of its digits is 768, while the sum is 21.

The square root of 212142243 is about 14565.1036041629. The cubic root of 212142243 is about 596.4065239599.

Adding to 212142243 its reverse (342241212), we get a palindrome (554383455).

The spelling of 212142243 in words is "two hundred twelve million, one hundred forty-two thousand, two hundred forty-three".