11121225 has 24 divisors (see below), whose sum is σ = 18629760.
Its totient is φ = 5853120.
The previous prime is 11121223. The next prime is 11121307. The reversal of 11121225 is 52212111.
It is not a de Polignac number, because 11121225 - 21 = 11121223 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is not an unprimeable number, because it can be changed into a prime (11121223) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4987 + ... + 6863.
It is an arithmetic number, because the mean of its divisors is an integer number (776240).
Almost surely, 211121225 is an apocalyptic number.
11121225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
11121225 is a deficient number, since it is larger than the sum of its proper divisors (7508535).
11121225 is a wasteful number, since it uses less digits than its factorization.
11121225 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1969 (or 1964 counting only the distinct ones).
The product of its digits is 40, while the sum is 15.
The square root of 11121225 is about 3334.8500715924.
The cubic root of 11121225 is about 223.2120018662.
Adding to 11121225 its reverse (52212111), we get a palindrome (63333336).
The spelling of 11121225 in words is "eleven million, one hundred twenty-one thousand, two hundred twenty-five".