40021320091 has 8 divisors (see below), whose sum is σ = 40788502560. Its totient is φ = 39254584512.

The previous prime is 40021320077. The next prime is 40021320121. The reversal of 40021320091 is 19002312004.

40021320091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40021320091 - 2¹⁵ = 40021287323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40021320011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71970 + ... + 291928.

It is an arithmetic number, because the mean of its divisors is an integer number (5098562820).

Almost surely, 2^40021320091 is an apocalyptic number.

40021320091 is a deficient number, since it is larger than the sum of its proper divisors (767182469).

40021320091 is a wasteful number, since it uses less digits than its factorization.

40021320091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223445.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 40021320091 its reverse (19002312004), we get a palindrome (59023632095).

The spelling of 40021320091 in words is "forty billion, twenty-one million, three hundred twenty thousand, ninety-one".