It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a de Polignac number, because none of the positive numbers 2k-213111311 is a prime.
It is a Duffinian number.
It is a congruent number.
Almost surely, 2213111311 is an apocalyptic number.
213111311 is an equidigital number, since it uses as much as digits as its factorization.
213111311 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 708061.
The square root of 213111311 is about 14598.3324732656. The cubic root of 213111311 is about 597.3132751027.
Adding to 213111311 its reverse (113111312), we get a palindrome (326222623).
Subtracting from 213111311 its reverse (113111312), we obtain a palindrome (99999999).
The spelling of 213111311 in words is "two hundred thirteen million, one hundred eleven thousand, three hundred eleven".