11121217 has 2 divisors, whose sum is σ = 11121218.
Its totient is φ = 11121216.
The previous prime is 11121197. The next prime is 11121223. The reversal of 11121217 is 71212111.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 6558721 + 4562496 = 2561^2 + 2136^2
It is a cyclic number.
It is not a de Polignac number, because 11121217 - 211 = 11119169 is a prime.
It is a super-2 number, since 2×111212172 = 247362935122178, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 11121217.
It is not a weakly prime, because it can be changed into another prime (11122217) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560608 + 5560609.
It is an arithmetic number, because the mean of its divisors is an integer number (5560609).
Almost surely, 211121217 is an apocalyptic number.
It is an amenable number.
11121217 is a deficient number, since it is larger than the sum of its proper divisors (1).
11121217 is an equidigital number, since it uses as much as digits as its factorization.
11121217 is an evil number, because the sum of its binary digits is even.
The product of its digits is 28, while the sum is 16.
The square root of 11121217 is about 3334.8488721380.
The cubic root of 11121217 is about 223.2119483440.
Adding to 11121217 its reverse (71212111), we get a palindrome (82333328).
The spelling of 11121217 in words is "eleven million, one hundred twenty-one thousand, two hundred seventeen".