47660221 has 4 divisors (see below), whose sum is σ = 54468832. Its totient is φ = 40851612.

The previous prime is 47660213. The next prime is 47660233. The reversal of 47660221 is 12206674.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47660221 - 2³ = 47660213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47660221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47660201) 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, 3404295 + ... + 3404308.

It is an arithmetic number, because the mean of its divisors is an integer number (13617208).

Almost surely, 2^47660221 is an apocalyptic number.

It is an amenable number.

47660221 is a deficient number, since it is larger than the sum of its proper divisors (6808611).

47660221 is an equidigital number, since it uses as much as digits as its factorization.

47660221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6808610.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 47660221 is about 6903.6382437089. The cubic root of 47660221 is about 362.5645602017.

Adding to 47660221 its reverse (12206674), we get a palindrome (59866895).

The spelling of 47660221 in words is "forty-seven million, six hundred sixty thousand, two hundred twenty-one".