212031223 has 4 divisors (see below), whose sum is σ = 212234400. Its totient is φ = 211828048.

The previous prime is 212031173. The next prime is 212031251. The reversal of 212031223 is 322130212.

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 212031223 - 2⁹ = 212030711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212031197 and 212031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212031263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100015 + ... + 102112.

It is an arithmetic number, because the mean of its divisors is an integer number (53058600).

Almost surely, 2^212031223 is an apocalyptic number.

212031223 is a deficient number, since it is larger than the sum of its proper divisors (203177).

212031223 is a wasteful number, since it uses less digits than its factorization.

212031223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203176.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 212031223 is about 14561.2919413080. The cubic root of 212031223 is about 596.3024670387.

Adding to 212031223 its reverse (322130212), we get a palindrome (534161435).

The spelling of 212031223 in words is "two hundred twelve million, thirty-one thousand, two hundred twenty-three".