211322213 has 4 divisors (see below), whose sum is σ = 211824588. Its totient is φ = 210819840.

The previous prime is 211322203. The next prime is 211322219. The reversal of 211322213 is 312223112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86731969 + 124590244 = 9313^2 + 11162^2 .

It is a cyclic number.

It is not a de Polignac number, because 211322213 - 2⁶ = 211322149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211322191 and 211322200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211322219) 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, 250556 + ... + 251397.

It is an arithmetic number, because the mean of its divisors is an integer number (52956147).

Almost surely, 2^211322213 is an apocalyptic number.

It is an amenable number.

211322213 is a deficient number, since it is larger than the sum of its proper divisors (502375).

211322213 is an equidigital number, since it uses as much as digits as its factorization.

211322213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502374.

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

The square root of 211322213 is about 14536.9258442079. The cubic root of 211322213 is about 595.6370673358.

Adding to 211322213 its reverse (312223112), we get a palindrome (523545325).

The spelling of 211322213 in words is "two hundred eleven million, three hundred twenty-two thousand, two hundred thirteen".