4450021 has 4 divisors (see below), whose sum is σ = 4603500. Its totient is φ = 4296544.

The previous prime is 4450013. The next prime is 4450031. The reversal of 4450021 is 1200544.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 893025 + 3556996 = 945^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 4450021 - 2³ = 4450013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4449977 and 4450004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4450031) 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 3 ways as a sum of consecutive naturals, for example, 76696 + ... + 76753.

It is an arithmetic number, because the mean of its divisors is an integer number (1150875).

Almost surely, 2^4450021 is an apocalyptic number.

It is an amenable number.

4450021 is a deficient number, since it is larger than the sum of its proper divisors (153479).

4450021 is a wasteful number, since it uses less digits than its factorization.

4450021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153478.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 4450021 is about 2109.5072884444. The cubic root of 4450021 is about 164.4828743916.

Adding to 4450021 its reverse (1200544), we get a palindrome (5650565).

It can be divided in two parts, 44500 and 21, that added together give a square (44521 = 211²).

The spelling of 4450021 in words is "four million, four hundred fifty thousand, twenty-one".