802171358821 has 16 divisors (see below), whose sum is σ = 934829040384. Its totient is φ = 674050351104.

The previous prime is 802171358783. The next prime is 802171358839. The reversal of 802171358821 is 128853171208.

802171358821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 802171358821 - 2⁷ = 802171358693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802171358221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430236 + ... + 1337701.

It is an arithmetic number, because the mean of its divisors is an integer number (58426815024).

Almost surely, 2^802171358821 is an apocalyptic number.

It is an amenable number.

802171358821 is a deficient number, since it is larger than the sum of its proper divisors (132657681563).

802171358821 is a wasteful number, since it uses less digits than its factorization.

802171358821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769220.

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

The spelling of 802171358821 in words is "eight hundred two billion, one hundred seventy-one million, three hundred fifty-eight thousand, eight hundred twenty-one".