852205720821 has 16 divisors (see below), whose sum is σ = 1398491439744. Its totient is φ = 449515105344.

The previous prime is 852205720801. The next prime is 852205720823. The reversal of 852205720821 is 128027502258.

It is not a de Polignac number, because 852205720821 - 2¹⁵ = 852205688053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (852205720823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1560816066 + ... + 1560816611.

It is an arithmetic number, because the mean of its divisors is an integer number (87405714984).

Almost surely, 2^852205720821 is an apocalyptic number.

It is an amenable number.

852205720821 is a deficient number, since it is larger than the sum of its proper divisors (546285718923).

852205720821 is a wasteful number, since it uses less digits than its factorization.

852205720821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121632700.

The product of its (nonzero) digits is 179200, while the sum is 42.

The spelling of 852205720821 in words is "eight hundred fifty-two billion, two hundred five million, seven hundred twenty thousand, eight hundred twenty-one".