212101213 has 4 divisors (see below), whose sum is σ = 212770620. Its totient is φ = 211431808.

The previous prime is 212101207. The next prime is 212101223. The reversal of 212101213 is 312101212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 120956004 + 91145209 = 10998^2 + 9547^2 .

It is a cyclic number.

It is not a de Polignac number, because 212101213 - 2⁵ = 212101181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212101193 and 212101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101223) 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, 334228 + ... + 334861.

It is an arithmetic number, because the mean of its divisors is an integer number (53192655).

Almost surely, 2^212101213 is an apocalyptic number.

It is an amenable number.

212101213 is a deficient number, since it is larger than the sum of its proper divisors (669407).

212101213 is an equidigital number, since it uses as much as digits as its factorization.

212101213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669406.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 212101213 is about 14563.6950325115. The cubic root of 212101213 is about 596.3680715563.

Adding to 212101213 its reverse (312101212), we get a palindrome (524202425).

Subtracting 212101213 from its reverse (312101212), we obtain a palindrome (99999999).

The spelling of 212101213 in words is "two hundred twelve million, one hundred one thousand, two hundred thirteen".