40243404021 has 4 divisors (see below), whose sum is σ = 53657872032. Its totient is φ = 26828936012.

The previous prime is 40243403957. The next prime is 40243404077. The reversal of 40243404021 is 12040434204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40243404021 - 2⁶ = 40243403957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40243403982 and 40243404000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40243404821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6707234001 + ... + 6707234006.

It is an arithmetic number, because the mean of its divisors is an integer number (13414468008).

Almost surely, 2^40243404021 is an apocalyptic number.

It is an amenable number.

40243404021 is a deficient number, since it is larger than the sum of its proper divisors (13414468011).

40243404021 is a wasteful number, since it uses less digits than its factorization.

40243404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13414468010.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 40243404021 its reverse (12040434204), we get a palindrome (52283838225).

The spelling of 40243404021 in words is "forty billion, two hundred forty-three million, four hundred four thousand, twenty-one".