211121213 has 2 divisors, whose sum is σ = 211121214.
Its totient is φ = 211121212.
The previous prime is 211121203. The next prime is 211121237. The reversal of 211121213 is 312121112.
It is a m-pointer prime, because the next prime (211121237) can be obtained adding 211121213 to its product of digits (24).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 124500964 + 86620249 = 11158^2 + 9307^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-211121213 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (211121203) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560606 + 105560607.
It is an arithmetic number, because the mean of its divisors is an integer number (105560607).
Almost surely, 2211121213 is an apocalyptic number.
It is an amenable number.
211121213 is a deficient number, since it is larger than the sum of its proper divisors (1).
211121213 is an equidigital number, since it uses as much as digits as its factorization.
211121213 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 24, while the sum is 14.
The square root of 211121213 is about 14530.0107708150.
The cubic root of 211121213 is about 595.4481598735.
Adding to 211121213 its reverse (312121112), we get a palindrome (523242325).
The spelling of 211121213 in words is "two hundred eleven million, one hundred twenty-one thousand, two hundred thirteen".