821144451073 has 8 divisors (see below), whose sum is σ = 869505972192. Its totient is φ = 772789475136.

The previous prime is 821144451067. The next prime is 821144451089. The reversal of 821144451073 is 370154441128.

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 821144451073 - 2²¹ = 821142353921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821144451473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1376815 + ... + 1880932.

It is an arithmetic number, because the mean of its divisors is an integer number (108688246524).

Almost surely, 2^821144451073 is an apocalyptic number.

It is an amenable number.

821144451073 is a deficient number, since it is larger than the sum of its proper divisors (48361521119).

821144451073 is a wasteful number, since it uses less digits than its factorization.

821144451073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272591.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 821144451073 in words is "eight hundred twenty-one billion, one hundred forty-four million, four hundred fifty-one thousand, seventy-three".