211223213 has 4 divisors (see below), whose sum is σ = 211252608. Its totient is φ = 211193820.

The previous prime is 211223137. The next prime is 211223231. The reversal of 211223213 is 312322112.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 211223213 - 2²⁴ = 194445997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211223191 and 211223200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211223263) 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, 4070 + ... + 20952.

It is an arithmetic number, because the mean of its divisors is an integer number (52813152).

Almost surely, 2^211223213 is an apocalyptic number.

It is an amenable number.

211223213 is a deficient number, since it is larger than the sum of its proper divisors (29395).

211223213 is a wasteful number, since it uses less digits than its factorization.

211223213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29394.

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

The square root of 211223213 is about 14533.5203237206. The cubic root of 211223213 is about 595.5440383389.

Adding to 211223213 its reverse (312322112), we get a palindrome (523545325).

The spelling of 211223213 in words is "two hundred eleven million, two hundred twenty-three thousand, two hundred thirteen".