212231213 has 4 divisors (see below), whose sum is σ = 224715420. Its totient is φ = 199747008.

The previous prime is 212231207. The next prime is 212231219. The reversal of 212231213 is 312132212.

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

It is an interprime number because it is at equal distance from previous prime (212231207) and next prime (212231219).

It can be written as a sum of positive squares in 2 ways, for example, as 192044164 + 20187049 = 13858^2 + 4493^2 .

It is not a de Polignac number, because 212231213 - 2¹⁶ = 212165677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 12484189 = 212231213 / (2 + 1 + 2 + 2 + 3 + 1 + 2 + 1 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212231191 and 212231200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212231219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6242078 + ... + 6242111.

It is an arithmetic number, because the mean of its divisors is an integer number (56178855).

Almost surely, 2^212231213 is an apocalyptic number.

It is an amenable number.

212231213 is a deficient number, since it is larger than the sum of its proper divisors (12484207).

212231213 is a wasteful number, since it uses less digits than its factorization.

212231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12484206.

The product of its digits is 144, while the sum is 17.

The square root of 212231213 is about 14568.1575018943. The cubic root of 212231213 is about 596.4898876369.

Adding to 212231213 its reverse (312132212), we get a palindrome (524363425).

Subtracting 212231213 from its reverse (312132212), we obtain a palindrome (99900999).

The spelling of 212231213 in words is "two hundred twelve million, two hundred thirty-one thousand, two hundred thirteen".