453440221 has 4 divisors (see below), whose sum is σ = 488320252. Its totient is φ = 418560192.

The previous prime is 453440209. The next prime is 453440231. The reversal of 453440221 is 122044354.

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 303108100 + 150332121 = 17410^2 + 12261^2 .

It is a cyclic number.

It is not a de Polignac number, because 453440221 - 2²¹ = 451343069 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 (453440231) 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, 17439996 + ... + 17440021.

It is an arithmetic number, because the mean of its divisors is an integer number (122080063).

Almost surely, 2^453440221 is an apocalyptic number.

It is an amenable number.

453440221 is a deficient number, since it is larger than the sum of its proper divisors (34880031).

453440221 is a wasteful number, since it uses less digits than its factorization.

453440221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34880030.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 453440221 is about 21294.1358359526. The cubic root of 453440221 is about 768.2572724989.

Adding to 453440221 its reverse (122044354), we get a palindrome (575484575).

The spelling of 453440221 in words is "four hundred fifty-three million, four hundred forty thousand, two hundred twenty-one".