16821580241 has 4 divisors (see below), whose sum is σ = 16994998692. Its totient is φ = 16648161792.

The previous prime is 16821580207. The next prime is 16821580267. The reversal of 16821580241 is 14208512861.

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 4451691841 + 12369888400 = 66721^2 + 111220^2 .

It is a cyclic number.

It is not a de Polignac number, because 16821580241 - 2¹⁰ = 16821579217 is a prime.

It is a super-3 number, since 3×16821580241³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16821580195 and 16821580204.

It is not an unprimeable number, because it can be changed into a prime (16821580141) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 86709080 + ... + 86709273.

It is an arithmetic number, because the mean of its divisors is an integer number (4248749673).

Almost surely, 2^16821580241 is an apocalyptic number.

It is an amenable number.

16821580241 is a deficient number, since it is larger than the sum of its proper divisors (173418451).

16821580241 is an equidigital number, since it uses as much as digits as its factorization.

16821580241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173418450.

The product of its (nonzero) digits is 30720, while the sum is 38.

The spelling of 16821580241 in words is "sixteen billion, eight hundred twenty-one million, five hundred eighty thousand, two hundred forty-one".