213212213 has 4 divisors (see below), whose sum is σ = 213275148. Its totient is φ = 213149280.

The previous prime is 213212179. The next prime is 213212261. The reversal of 213212213 is 312212312.

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 39025009 + 174187204 = 6247^2 + 13198^2 .

It is a cyclic number.

It is not a de Polignac number, because 213212213 - 2¹⁸ = 212950069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213212191 and 213212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213212273) 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, 26078 + ... + 33263.

It is an arithmetic number, because the mean of its divisors is an integer number (53318787).

Almost surely, 2^213212213 is an apocalyptic number.

It is an amenable number.

213212213 is a deficient number, since it is larger than the sum of its proper divisors (62935).

213212213 is an equidigital number, since it uses as much as digits as its factorization.

213212213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62934.

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

The square root of 213212213 is about 14601.7880069531. The cubic root of 213212213 is about 597.4075303759.

Adding to 213212213 its reverse (312212312), we get a palindrome (525424525).

Subtracting 213212213 from its reverse (312212312), we obtain a palindrome (99000099).

The spelling of 213212213 in words is "two hundred thirteen million, two hundred twelve thousand, two hundred thirteen".