447405221 has 4 divisors (see below), whose sum is σ = 459497292. Its totient is φ = 435313152.

The previous prime is 447405209. The next prime is 447405253. The reversal of 447405221 is 122504744.

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 425968321 + 21436900 = 20639^2 + 4630^2 .

It is a cyclic number.

It is not a de Polignac number, because 447405221 - 2¹⁰ = 447404197 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 (447435221) 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, 6045980 + ... + 6046053.

It is an arithmetic number, because the mean of its divisors is an integer number (114874323).

Almost surely, 2^447405221 is an apocalyptic number.

It is an amenable number.

447405221 is a deficient number, since it is larger than the sum of its proper divisors (12092071).

447405221 is a wasteful number, since it uses less digits than its factorization.

447405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12092070.

The product of its (nonzero) digits is 8960, while the sum is 29.

The square root of 447405221 is about 21151.9554887958. The cubic root of 447405221 is about 764.8337007335.

Adding to 447405221 its reverse (122504744), we get a palindrome (569909965).

The spelling of 447405221 in words is "four hundred forty-seven million, four hundred five thousand, two hundred twenty-one".