40330021 has 4 divisors (see below), whose sum is σ = 40379500. Its totient is φ = 40280544.

The previous prime is 40330013. The next prime is 40330049. The reversal of 40330021 is 12003304.

40330021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 19980900 + 20349121 = 4470^2 + 4511^2 .

It is a cyclic number.

It is not a de Polignac number, because 40330021 - 2³ = 40330013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40329983 and 40330010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40330051) 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, 23496 + ... + 25153.

It is an arithmetic number, because the mean of its divisors is an integer number (10094875).

Almost surely, 2^40330021 is an apocalyptic number.

It is an amenable number.

40330021 is a deficient number, since it is larger than the sum of its proper divisors (49479).

40330021 is an equidigital number, since it uses as much as digits as its factorization.

40330021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49478.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 40330021 is about 6350.5921771123. The cubic root of 40330021 is about 342.9331610789.

Adding to 40330021 its reverse (12003304), we get a palindrome (52333325).

The spelling of 40330021 in words is "forty million, three hundred thirty thousand, twenty-one".