451320221 has 4 divisors (see below), whose sum is σ = 492349344. Its totient is φ = 410291100.

The previous prime is 451320197. The next prime is 451320223. The reversal of 451320221 is 122023154.

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 a cyclic number.

It is not a de Polignac number, because 451320221 - 2²⁶ = 384211357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 451320193 and 451320202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451320223) 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, 20514545 + ... + 20514566.

It is an arithmetic number, because the mean of its divisors is an integer number (123087336).

Almost surely, 2^451320221 is an apocalyptic number.

It is an amenable number.

451320221 is a deficient number, since it is larger than the sum of its proper divisors (41029123).

451320221 is a wasteful number, since it uses less digits than its factorization.

451320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41029122.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 451320221 is about 21244.2985527882. The cubic root of 451320221 is about 767.0581064923.

Adding to 451320221 its reverse (122023154), we get a palindrome (573343375).

The spelling of 451320221 in words is "four hundred fifty-one million, three hundred twenty thousand, two hundred twenty-one".