40405043021 has 4 divisors (see below), whose sum is σ = 46177192032. Its totient is φ = 34632894012.

The previous prime is 40405042999. The next prime is 40405043027. The reversal of 40405043021 is 12034050404.

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 40405043021 - 2³⁰ = 39331301197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40405043027) 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, 2886074495 + ... + 2886074508.

It is an arithmetic number, because the mean of its divisors is an integer number (11544298008).

Almost surely, 2^40405043021 is an apocalyptic number.

It is an amenable number.

40405043021 is a deficient number, since it is larger than the sum of its proper divisors (5772149011).

40405043021 is an equidigital number, since it uses as much as digits as its factorization.

40405043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5772149010.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 40405043021 its reverse (12034050404), we get a palindrome (52439093425).

The spelling of 40405043021 in words is "forty billion, four hundred five million, forty-three thousand, twenty-one".