821870995792 has 160 divisors (see below), whose sum is σ = 2059154705664. Its totient is φ = 308468736000.

The previous prime is 821870995739. The next prime is 821870995801. The reversal of 821870995792 is 297599078128.

821870995792 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4514728 + ... + 4693240.

Almost surely, 2^821870995792 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 821870995792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1029577352832).

821870995792 is an abundant number, since it is smaller than the sum of its proper divisors (1237283709872).

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

821870995792 is a wasteful number, since it uses less digits than its factorization.

821870995792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178677 (or 178671 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 67.

The spelling of 821870995792 in words is "eight hundred twenty-one billion, eight hundred seventy million, nine hundred ninety-five thousand, seven hundred ninety-two".