21817852943041 has 4 divisors (see below), whose sum is σ = 21887558543812. Its totient is φ = 21748147342272.

The previous prime is 21817852943023. The next prime is 21817852943063. The reversal of 21817852943041 is 14034925871812.

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 2810903730625 + 19006949212416 = 1676575^2 + 4359696^2 .

It is a cyclic number.

It is not a de Polignac number, because 21817852943041 - 2¹¹ = 21817852940993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21817852943021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34852799916 + ... + 34852800541.

It is an arithmetic number, because the mean of its divisors is an integer number (5471889635953).

Almost surely, 2^{21817852943041} is an apocalyptic number.

It is an amenable number.

21817852943041 is a deficient number, since it is larger than the sum of its proper divisors (69705600771).

21817852943041 is an equidigital number, since it uses as much as digits as its factorization.

21817852943041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69705600770.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 21817852943041 in words is "twenty-one trillion, eight hundred seventeen billion, eight hundred fifty-two million, nine hundred forty-three thousand, forty-one".