447271221 has 4 divisors (see below), whose sum is σ = 596361632. Its totient is φ = 298180812.

The previous prime is 447271157. The next prime is 447271243. The reversal of 447271221 is 122172744.

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 447271221 - 2⁶ = 447271157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (447271261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74545201 + ... + 74545206.

It is an arithmetic number, because the mean of its divisors is an integer number (149090408).

Almost surely, 2^447271221 is an apocalyptic number.

It is an amenable number.

447271221 is a deficient number, since it is larger than the sum of its proper divisors (149090411).

447271221 is a wasteful number, since it uses less digits than its factorization.

447271221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149090410.

The product of its digits is 6272, while the sum is 30.

The square root of 447271221 is about 21148.7876957522. The cubic root of 447271221 is about 764.7573359940.

The spelling of 447271221 in words is "four hundred forty-seven million, two hundred seventy-one thousand, two hundred twenty-one".