21140513841985 has 8 divisors (see below), whose sum is σ = 25497391315176. Its totient is φ = 16826561270400.

The previous prime is 21140513841961. The next prime is 21140513841991. The reversal of 21140513841985 is 58914831504112.

It can be written as a sum of positive squares in 4 ways, for example, as 8740868598016 + 12399645243969 = 2956496^2 + 3521313^2 .

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

It is not a de Polignac number, because 21140513841985 - 2¹⁷ = 21140513710913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10731224316 + ... + 10731226285.

It is an arithmetic number, because the mean of its divisors is an integer number (3187173914397).

Almost surely, 2^{21140513841985} is an apocalyptic number.

It is an amenable number.

21140513841985 is a deficient number, since it is larger than the sum of its proper divisors (4356877473191).

21140513841985 is a wasteful number, since it uses less digits than its factorization.

21140513841985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21462450803.

The product of its (nonzero) digits is 1382400, while the sum is 52.

The spelling of 21140513841985 in words is "twenty-one trillion, one hundred forty billion, five hundred thirteen million, eight hundred forty-one thousand, nine hundred eighty-five".