40540405421 has 4 divisors (see below), whose sum is σ = 41636092092. Its totient is φ = 39444718752.

The previous prime is 40540405391. The next prime is 40540405487. The reversal of 40540405421 is 12450404504.

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 30770071396 + 9770334025 = 175414^2 + 98845^2 .

It is a cyclic number.

It is not a de Polignac number, because 40540405421 - 2⁶ = 40540405357 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 (40540005421) 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, 547843280 + ... + 547843353.

It is an arithmetic number, because the mean of its divisors is an integer number (10409023023).

Almost surely, 2^40540405421 is an apocalyptic number.

It is an amenable number.

40540405421 is a deficient number, since it is larger than the sum of its proper divisors (1095686671).

40540405421 is a wasteful number, since it uses less digits than its factorization.

40540405421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095686670.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 40540405421 its reverse (12450404504), we get a palindrome (52990809925).

The spelling of 40540405421 in words is "forty billion, five hundred forty million, four hundred five thousand, four hundred twenty-one".