43660221 has 16 divisors (see below), whose sum is σ = 63616320. Its totient is φ = 26414720.

The previous prime is 43660217. The next prime is 43660229. The reversal of 43660221 is 12206634.

It is a cyclic number.

It is not a de Polignac number, because 43660221 - 2² = 43660217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43660191 and 43660200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43660229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36001 + ... + 37193.

It is an arithmetic number, because the mean of its divisors is an integer number (3976020).

Almost surely, 2^43660221 is an apocalyptic number.

It is an amenable number.

43660221 is a deficient number, since it is larger than the sum of its proper divisors (19956099).

43660221 is a wasteful number, since it uses less digits than its factorization.

43660221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 43660221 is about 6607.5881378912. The cubic root of 43660221 is about 352.1237431889.

Adding to 43660221 its reverse (12206634), we get a palindrome (55866855).

The spelling of 43660221 in words is "forty-three million, six hundred sixty thousand, two hundred twenty-one".