450520021 has 8 divisors (see below), whose sum is σ = 537266304. Its totient is φ = 369370320.

The previous prime is 450519997. The next prime is 450520027. The reversal of 450520021 is 120025054.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 450520021 - 2¹¹ = 450517973 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 (450520027) 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 7 ways as a sum of consecutive naturals, for example, 1398970 + ... + 1399291.

It is an arithmetic number, because the mean of its divisors is an integer number (67158288).

Almost surely, 2^450520021 is an apocalyptic number.

It is an amenable number.

450520021 is a deficient number, since it is larger than the sum of its proper divisors (86746283).

450520021 is a wasteful number, since it uses less digits than its factorization.

450520021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798291.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 450520021 is about 21225.4569090986. The cubic root of 450520021 is about 766.6045017228.

Adding to 450520021 its reverse (120025054), we get a palindrome (570545075).

The spelling of 450520021 in words is "four hundred fifty million, five hundred twenty thousand, twenty-one".