211243240213 has 4 divisors (see below), whose sum is σ = 211285067328. Its totient is φ = 211201413100.

The previous prime is 211243240177. The next prime is 211243240223. The reversal of 211243240213 is 312042342112.

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 a cyclic number.

It is not a de Polignac number, because 211243240213 - 2²⁹ = 210706369301 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 (211243240223) 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, 20905981 + ... + 20916082.

It is an arithmetic number, because the mean of its divisors is an integer number (52821266832).

Almost surely, 2^211243240213 is an apocalyptic number.

It is an amenable number.

211243240213 is a deficient number, since it is larger than the sum of its proper divisors (41827115).

211243240213 is an equidigital number, since it uses as much as digits as its factorization.

211243240213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41827114.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 211243240213 its reverse (312042342112), we get a palindrome (523285582325).

The spelling of 211243240213 in words is "two hundred eleven billion, two hundred forty-three million, two hundred forty thousand, two hundred thirteen".