211321213 has 2 divisors, whose sum is σ = 211321214. Its totient is φ = 211321212.

The previous prime is 211321207. The next prime is 211321223. The reversal of 211321213 is 312123112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140138244 + 71182969 = 11838^2 + 8437^2 .

It is a cyclic number.

It is not a de Polignac number, because 211321213 - 2⁵ = 211321181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211321223) 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 as a sum of consecutive naturals, namely, 105660606 + 105660607.

It is an arithmetic number, because the mean of its divisors is an integer number (105660607).

Almost surely, 2^211321213 is an apocalyptic number.

It is an amenable number.

211321213 is a deficient number, since it is larger than the sum of its proper divisors (1).

211321213 is an equidigital number, since it uses as much as digits as its factorization.

211321213 is an odious number, because the sum of its binary digits is odd.

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

The square root of 211321213 is about 14536.8914489997. The cubic root of 211321213 is about 595.6361277942.

Adding to 211321213 its reverse (312123112), we get a palindrome (523444325).

The spelling of 211321213 in words is "two hundred eleven million, three hundred twenty-one thousand, two hundred thirteen".