213022213 has 4 divisors (see below), whose sum is σ = 213497100. Its totient is φ = 212547328.

The previous prime is 213022169. The next prime is 213022217. The reversal of 213022213 is 312220312.

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 126495009 + 86527204 = 11247^2 + 9302^2 .

It is a cyclic number.

It is not a de Polignac number, because 213022213 - 2⁹ = 213021701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213022217) 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, 236770 + ... + 237667.

It is an arithmetic number, because the mean of its divisors is an integer number (53374275).

Almost surely, 2^213022213 is an apocalyptic number.

It is an amenable number.

213022213 is a deficient number, since it is larger than the sum of its proper divisors (474887).

213022213 is an equidigital number, since it uses as much as digits as its factorization.

213022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474886.

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

The square root of 213022213 is about 14595.2805043274. The cubic root of 213022213 is about 597.2300215260.

Adding to 213022213 its reverse (312220312), we get a palindrome (525242525).

The spelling of 213022213 in words is "two hundred thirteen million, twenty-two thousand, two hundred thirteen".