47284221 has 4 divisors (see below), whose sum is σ = 63045632. Its totient is φ = 31522812.

The previous prime is 47284201. The next prime is 47284229. The reversal of 47284221 is 12248274.

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 not a de Polignac number, because 47284221 - 2⁵ = 47284189 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 (47284229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7880701 + ... + 7880706.

It is an arithmetic number, because the mean of its divisors is an integer number (15761408).

Almost surely, 2^47284221 is an apocalyptic number.

It is an amenable number.

47284221 is a deficient number, since it is larger than the sum of its proper divisors (15761411).

47284221 is a wasteful number, since it uses less digits than its factorization.

47284221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15761410.

The product of its digits is 7168, while the sum is 30.

The square root of 47284221 is about 6876.3523033655. The cubic root of 47284221 is about 361.6085963193.

The spelling of 47284221 in words is "forty-seven million, two hundred eighty-four thousand, two hundred twenty-one".