40413040021 has 4 divisors (see below), whose sum is σ = 40436524044. Its totient is φ = 40389556000.

The previous prime is 40413040013. The next prime is 40413040049. The reversal of 40413040021 is 12004031404.

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 26761688100 + 13651351921 = 163590^2 + 116839^2 .

It is a cyclic number.

It is not a de Polignac number, because 40413040021 - 2³ = 40413040013 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 (40413040081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11739430 + ... + 11742871.

It is an arithmetic number, because the mean of its divisors is an integer number (10109131011).

Almost surely, 2^40413040021 is an apocalyptic number.

It is an amenable number.

40413040021 is a deficient number, since it is larger than the sum of its proper divisors (23484023).

40413040021 is a wasteful number, since it uses less digits than its factorization.

40413040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23484022.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 40413040021 its reverse (12004031404), we get a palindrome (52417071425).

The spelling of 40413040021 in words is "forty billion, four hundred thirteen million, forty thousand, twenty-one".