36660221 has 4 divisors (see below), whose sum is σ = 39480252. Its totient is φ = 33840192.

The previous prime is 36660199. The next prime is 36660223. The reversal of 36660221 is 12206663.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9765625 + 26894596 = 3125^2 + 5186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36660221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36660223) 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 3 ways as a sum of consecutive naturals, for example, 1409996 + ... + 1410021.

It is an arithmetic number, because the mean of its divisors is an integer number (9870063).

Almost surely, 2^36660221 is an apocalyptic number.

It is an amenable number.

36660221 is a deficient number, since it is larger than the sum of its proper divisors (2820031).

36660221 is a wasteful number, since it uses less digits than its factorization.

36660221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820030.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 36660221 is about 6054.7684513943. The cubic root of 36660221 is about 332.1990296661.

Adding to 36660221 its reverse (12206663), we get a palindrome (48866884).

The spelling of 36660221 in words is "thirty-six million, six hundred sixty thousand, two hundred twenty-one".