43836005821 has 2 divisors, whose sum is σ = 43836005822. Its totient is φ = 43836005820.

The previous prime is 43836005753. The next prime is 43836005827. The reversal of 43836005821 is 12850063834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40743422500 + 3092583321 = 201850^2 + 55611^2 .

It is a cyclic number.

It is not a de Polignac number, because 43836005821 - 2¹³ = 43835997629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43836005827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21918002910 + 21918002911.

It is an arithmetic number, because the mean of its divisors is an integer number (21918002911).

Almost surely, 2^43836005821 is an apocalyptic number.

It is an amenable number.

43836005821 is a deficient number, since it is larger than the sum of its proper divisors (1).

43836005821 is an equidigital number, since it uses as much as digits as its factorization.

43836005821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 43836005821 in words is "forty-three billion, eight hundred thirty-six million, five thousand, eight hundred twenty-one".