211123213 has 6 divisors (see below), whose sum is σ = 245592366. Its totient is φ = 180962712.

The previous prime is 211123207. The next prime is 211123261. The reversal of 211123213 is 312321112.

211123213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 147331044 + 63792169 = 12138^2 + 7987^2 .

It is not a de Polignac number, because 211123213 - 2¹⁷ = 210992141 is a prime.

It is a super-2 number, since 2×211123213² = 89146022134886738, 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 (211123273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2154270 + ... + 2154367.

It is an arithmetic number, because the mean of its divisors is an integer number (40932061).

Almost surely, 2^211123213 is an apocalyptic number.

It is an amenable number.

211123213 is a deficient number, since it is larger than the sum of its proper divisors (34469153).

211123213 is an equidigital number, since it uses as much as digits as its factorization.

211123213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308651 (or 4308644 counting only the distinct ones).

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

The square root of 211123213 is about 14530.0795937256. The cubic root of 211123213 is about 595.4500401402.

Adding to 211123213 its reverse (312321112), we get a palindrome (523444325).

The spelling of 211123213 in words is "two hundred eleven million, one hundred twenty-three thousand, two hundred thirteen".