40021037436691 has 4 divisors (see below), whose sum is σ = 41401073210400. Its totient is φ = 38641001662984.

The previous prime is 40021037436671. The next prime is 40021037436707. The reversal of 40021037436691 is 19663473012004.

40021037436691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40021037436691 - 2³³ = 40012447502099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40021037436671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690017886811 + ... + 690017886868.

It is an arithmetic number, because the mean of its divisors is an integer number (10350268302600).

Almost surely, 2^{40021037436691} is an apocalyptic number.

40021037436691 is a deficient number, since it is larger than the sum of its proper divisors (1380035773709).

40021037436691 is a wasteful number, since it uses less digits than its factorization.

40021037436691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380035773708.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 40021037436691 in words is "forty trillion, twenty-one billion, thirty-seven million, four hundred thirty-six thousand, six hundred ninety-one".