21943586873 has 8 divisors (see below), whose sum is σ = 24077434248. Its totient is φ = 19873436544.

The previous prime is 21943586867. The next prime is 21943586897. The reversal of 21943586873 is 37868534912.

It can be written as a sum of positive squares in 4 ways, for example, as 366033424 + 21577553449 = 19132^2 + 146893^2 .

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

It is not a de Polignac number, because 21943586873 - 2¹² = 21943582777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21943586573) 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, 15923540 + ... + 15924917.

It is an arithmetic number, because the mean of its divisors is an integer number (3009679281).

Almost surely, 2^21943586873 is an apocalyptic number.

It is an amenable number.

21943586873 is a deficient number, since it is larger than the sum of its proper divisors (2133847375).

21943586873 is a wasteful number, since it uses less digits than its factorization.

21943586873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31848523.

The product of its digits is 8709120, while the sum is 56.

The spelling of 21943586873 in words is "twenty-one billion, nine hundred forty-three million, five hundred eighty-six thousand, eight hundred seventy-three".