450542021 has 4 divisors (see below), whose sum is σ = 450657132. Its totient is φ = 450426912.

The previous prime is 450541981. The next prime is 450542023. The reversal of 450542021 is 120245054.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120245054 = 2 ⋅60122527.

It can be written as a sum of positive squares in 2 ways, for example, as 292033921 + 158508100 = 17089^2 + 12590^2 .

It is a cyclic number.

It is not a de Polignac number, because 450542021 - 2¹⁸ = 450279877 is a prime.

It is a super-2 number, since 2×450542021² = 405976225373528882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450542023) 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, 51470 + ... + 59583.

It is an arithmetic number, because the mean of its divisors is an integer number (112664283).

Almost surely, 2^450542021 is an apocalyptic number.

It is an amenable number.

450542021 is a deficient number, since it is larger than the sum of its proper divisors (115111).

450542021 is a wasteful number, since it uses less digits than its factorization.

450542021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115110.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 450542021 is about 21225.9751483884. The cubic root of 450542021 is about 766.6169799137.

Adding to 450542021 its reverse (120245054), we get a palindrome (570787075).

The spelling of 450542021 in words is "four hundred fifty million, five hundred forty-two thousand, twenty-one".