40865117321721 has 32 divisors (see below), whose sum is σ = 68287286624256. Its totient is φ = 21117487680000.

The previous prime is 40865117321681. The next prime is 40865117321737. The reversal of 40865117321721 is 12712371156804.

It is not a de Polignac number, because 40865117321721 - 2³¹ = 40862969838073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40865117321921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 463058680 + ... + 463146921.

It is an arithmetic number, because the mean of its divisors is an integer number (2133977707008).

Almost surely, 2^{40865117321721} is an apocalyptic number.

It is an amenable number.

40865117321721 is a deficient number, since it is larger than the sum of its proper divisors (27422169302535).

40865117321721 is a wasteful number, since it uses less digits than its factorization.

40865117321721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926205813.

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 40865117321721 in words is "forty trillion, eight hundred sixty-five billion, one hundred seventeen million, three hundred twenty-one thousand, seven hundred twenty-one".