211430213 has 4 divisors (see below), whose sum is σ = 218720940. Its totient is φ = 204139488.

The previous prime is 211430203. The next prime is 211430227. The reversal of 211430213 is 312034112.

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 69772609 + 141657604 = 8353^2 + 11902^2 .

It is a cyclic number.

It is not a de Polignac number, because 211430213 - 2¹⁰ = 211429189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211430191 and 211430200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211430203) 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, 3645320 + ... + 3645377.

It is an arithmetic number, because the mean of its divisors is an integer number (54680235).

Almost surely, 2^211430213 is an apocalyptic number.

It is an amenable number.

211430213 is a deficient number, since it is larger than the sum of its proper divisors (7290727).

211430213 is an equidigital number, since it uses as much as digits as its factorization.

211430213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290726.

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

The square root of 211430213 is about 14540.6400478108. The cubic root of 211430213 is about 595.7385203833.

Adding to 211430213 its reverse (312034112), we get a palindrome (523464325).

The spelling of 211430213 in words is "two hundred eleven million, four hundred thirty thousand, two hundred thirteen".