16821533485 has 8 divisors (see below), whose sum is σ = 20239959960. Its totient is φ = 13421146944.

The previous prime is 16821533471. The next prime is 16821533489. The reversal of 16821533485 is 58433512861.

It can be written as a sum of positive squares in 4 ways, for example, as 3325367556 + 13496165929 = 57666^2 + 116173^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16821533485 - 2⁵ = 16821533453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821533489) 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 7 ways as a sum of consecutive naturals, for example, 4507930 + ... + 4511659.

It is an arithmetic number, because the mean of its divisors is an integer number (2529994995).

Almost surely, 2^16821533485 is an apocalyptic number.

It is an amenable number.

16821533485 is a deficient number, since it is larger than the sum of its proper divisors (3418426475).

16821533485 is an equidigital number, since it uses as much as digits as its factorization.

16821533485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9019967.

The product of its digits is 691200, while the sum is 46.

The spelling of 16821533485 in words is "sixteen billion, eight hundred twenty-one million, five hundred thirty-three thousand, four hundred eighty-five".