821802897792 has 96 divisors (see below), whose sum is σ = 2365599249000. Its totient is φ = 273844432896.

The previous prime is 821802897791. The next prime is 821802897859. The reversal of 821802897792 is 297798208128.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-4 number, since 4×821802897792⁴ (a number of 49 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821802897791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3443059 + ... + 3673997.

Almost surely, 2^821802897792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821802897792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182799624500).

821802897792 is an abundant number, since it is smaller than the sum of its proper divisors (1543796351208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821802897792 is a wasteful number, since it uses less digits than its factorization.

821802897792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234048 (or 234033 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 63.

The spelling of 821802897792 in words is "eight hundred twenty-one billion, eight hundred two million, eight hundred ninety-seven thousand, seven hundred ninety-two".