447032221 has 4 divisors (see below), whose sum is σ = 473328252. Its totient is φ = 420736192.

The previous prime is 447032219. The next prime is 447032249. The reversal of 447032221 is 122230744.

It is a happy number.

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 207216025 + 239816196 = 14395^2 + 15486^2 .

It is a cyclic number.

It is not a de Polignac number, because 447032221 - 2¹ = 447032219 is a prime.

It is a super-2 number, since 2×447032221² = 399675613224385682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (447032251) 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, 13147990 + ... + 13148023.

It is an arithmetic number, because the mean of its divisors is an integer number (118332063).

Almost surely, 2^447032221 is an apocalyptic number.

It is an amenable number.

447032221 is a deficient number, since it is larger than the sum of its proper divisors (26296031).

447032221 is a wasteful number, since it uses less digits than its factorization.

447032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26296030.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 447032221 is about 21143.1364986371. The cubic root of 447032221 is about 764.6210953418.

Adding to 447032221 its reverse (122230744), we get a palindrome (569262965).

The spelling of 447032221 in words is "four hundred forty-seven million, thirty-two thousand, two hundred twenty-one".