450021 has 16 divisors (see below), whose sum is σ = 705600. Its totient is φ = 251520.

The previous prime is 450019. The next prime is 450029. The reversal of 450021 is 120054.

It is not a de Polignac number, because 450021 - 2¹ = 450019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 449979 and 450006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96 + ... + 953.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2⁴⁵⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

450021 is a deficient number, since it is larger than the sum of its proper divisors (255579).

450021 is a wasteful number, since it uses less digits than its factorization.

450021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 450021 is about 670.8360455432. The cubic root of 450021 is about 76.6321352577.

Adding to 450021 its reverse (120054), we get a palindrome (570075).

The spelling of 450021 in words is "four hundred fifty thousand, twenty-one".