43862809021 has 4 divisors (see below), whose sum is σ = 43943886844. Its totient is φ = 43781731200.

The previous prime is 43862809009. The next prime is 43862809027. The reversal of 43862809021 is 12090826834.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15642504900 + 28220304121 = 125070^2 + 167989^2 .

It is a cyclic number.

It is not a de Polignac number, because 43862809021 - 2²⁷ = 43728591293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43862809027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40538100 + ... + 40539181.

It is an arithmetic number, because the mean of its divisors is an integer number (10985971711).

Almost surely, 2^43862809021 is an apocalyptic number.

It is an amenable number.

43862809021 is a deficient number, since it is larger than the sum of its proper divisors (81077823).

43862809021 is an equidigital number, since it uses as much as digits as its factorization.

43862809021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81077822.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 43862809021 in words is "forty-three billion, eight hundred sixty-two million, eight hundred nine thousand, twenty-one".