211434213 has 4 divisors (see below), whose sum is σ = 281912288. Its totient is φ = 140956140.

The previous prime is 211434203. The next prime is 211434221. The reversal of 211434213 is 312434112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 211434213 - 2⁹ = 211433701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211434213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211434203) 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, 35239033 + ... + 35239038.

It is an arithmetic number, because the mean of its divisors is an integer number (70478072).

Almost surely, 2^211434213 is an apocalyptic number.

It is an amenable number.

211434213 is a deficient number, since it is larger than the sum of its proper divisors (70478075).

211434213 is an equidigital number, since it uses as much as digits as its factorization.

211434213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70478074.

The product of its digits is 576, while the sum is 21.

The square root of 211434213 is about 14540.7775926874. Note that the first 3 decimals coincide. The cubic root of 211434213 is about 595.7422772401.

Adding to 211434213 its reverse (312434112), we get a palindrome (523868325).

The spelling of 211434213 in words is "two hundred eleven million, four hundred thirty-four thousand, two hundred thirteen".