211212213 has 4 divisors (see below), whose sum is σ = 281616288. Its totient is φ = 140808140.

The previous prime is 211212203. The next prime is 211212241. The reversal of 211212213 is 312212112.

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 211212213 - 2⁵ = 211212181 is a prime.

It is a super-2 number, since 2×211212213² = 89221197840714738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212192 and 211212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212203) 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, 35202033 + ... + 35202038.

It is an arithmetic number, because the mean of its divisors is an integer number (70404072).

Almost surely, 2^211212213 is an apocalyptic number.

It is an amenable number.

211212213 is a deficient number, since it is larger than the sum of its proper divisors (70404075).

211212213 is an equidigital number, since it uses as much as digits as its factorization.

211212213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70404074.

The product of its digits is 48, while the sum is 15.

The square root of 211212213 is about 14533.1418832956. The cubic root of 211212213 is about 595.5336999895.

Adding to 211212213 its reverse (312212112), we get a palindrome (523424325).

The spelling of 211212213 in words is "two hundred eleven million, two hundred twelve thousand, two hundred thirteen".