40243021 has 16 divisors (see below), whose sum is σ = 50004864. Its totient is φ = 31535424.

The previous prime is 40243019. The next prime is 40243033. The reversal of 40243021 is 12034204.

40243021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 40243021 - 2¹ = 40243019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40242986 and 40243004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40243001) 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 15 ways as a sum of consecutive naturals, for example, 7671 + ... + 11803.

It is an arithmetic number, because the mean of its divisors is an integer number (3125304).

Almost surely, 2^40243021 is an apocalyptic number.

It is an amenable number.

40243021 is a deficient number, since it is larger than the sum of its proper divisors (9761843).

40243021 is a wasteful number, since it uses less digits than its factorization.

40243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40243021 is about 6343.7387241279. The cubic root of 40243021 is about 342.6863915217.

Adding to 40243021 its reverse (12034204), we get a palindrome (52277225).

The spelling of 40243021 in words is "forty million, two hundred forty-three thousand, twenty-one".