821573012881 has 8 divisors (see below), whose sum is σ = 822053635200. Its totient is φ = 821092474512.

The previous prime is 821573012831. The next prime is 821573012903. The reversal of 821573012881 is 188210375128.

821573012881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 821573012881 - 2¹³ = 821573004689 is a prime.

It is a super-2 number, since 2×821573012881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821573012831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41144806 + ... + 41164768.

It is an arithmetic number, because the mean of its divisors is an integer number (102756704400).

Almost surely, 2^821573012881 is an apocalyptic number.

It is an amenable number.

821573012881 is a deficient number, since it is larger than the sum of its proper divisors (480622319).

821573012881 is a wasteful number, since it uses less digits than its factorization.

821573012881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41975.

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 821573012881 in words is "eight hundred twenty-one billion, five hundred seventy-three million, twelve thousand, eight hundred eighty-one".