450020021 has 16 divisors (see below), whose sum is σ = 495452160. Its totient is φ = 405363120.

The previous prime is 450019949. The next prime is 450020029. The reversal of 450020021 is 120020054.

It is a cyclic number.

It is not a de Polignac number, because 450020021 - 2¹⁸ = 449757877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 450019978 and 450020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450020029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939260 + ... + 939738.

It is an arithmetic number, because the mean of its divisors is an integer number (30965760).

Almost surely, 2^450020021 is an apocalyptic number.

It is an amenable number.

450020021 is a deficient number, since it is larger than the sum of its proper divisors (45432139).

450020021 is a wasteful number, since it uses less digits than its factorization.

450020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 450020021 is about 21213.6753298432. The cubic root of 450020021 is about 766.3207968777.

Adding to 450020021 its reverse (120020054), we get a palindrome (570040075).

The spelling of 450020021 in words is "four hundred fifty million, twenty thousand, twenty-one".