36663221 has 12 divisors (see below), whose sum is σ = 44121420.
Its totient is φ = 30340800.
The previous prime is 36663199. The next prime is 36663239. The reversal of 36663221 is 12236663.
Adding to 36663221 its reverse (12236663), we get a palindrome (48899884).
It can be written as a sum of positive squares in 2 ways, for example, as 19140625 + 17522596 = 4375^2 + 4186^2
It is not a de Polignac number, because 36663221 - 214 = 36646837 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (29).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (36663251) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11480 + ... + 14321.
It is an arithmetic number, because the mean of its divisors is an integer number (3676785).
Almost surely, 236663221 is an apocalyptic number.
It is an amenable number.
36663221 is a deficient number, since it is larger than the sum of its proper divisors (7458199).
36663221 is a wasteful number, since it uses less digits than its factorization.
36663221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 25844 (or 25837 counting only the distinct ones).
The product of its digits is 7776, while the sum is 29.
The square root of 36663221 is about 6055.0161849495.
The cubic root of 36663221 is about 332.2080909854.
The spelling of 36663221 in words is "thirty-six million, six hundred sixty-three thousand, two hundred twenty-one".