211213213 has 4 divisors (see below), whose sum is σ = 212612128. Its totient is φ = 209814300.

The previous prime is 211213207. The next prime is 211213229. The reversal of 211213213 is 312312112.

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 a de Polignac number, because none of the positive numbers 2^k-211213213 is a prime.

It is a super-2 number, since 2×211213213² = 89222042691566738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211213273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699231 + ... + 699532.

It is an arithmetic number, because the mean of its divisors is an integer number (53153032).

Almost surely, 2^211213213 is an apocalyptic number.

It is an amenable number.

211213213 is a deficient number, since it is larger than the sum of its proper divisors (1398915).

211213213 is a wasteful number, since it uses less digits than its factorization.

211213213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398914.

The product of its digits is 72, while the sum is 16.

The square root of 211213213 is about 14533.1762873778. The cubic root of 211213213 is about 595.5346398542.

Adding to 211213213 its reverse (312312112), we get a palindrome (523525325).

The spelling of 211213213 in words is "two hundred eleven million, two hundred thirteen thousand, two hundred thirteen".