850842052921 has 27 divisors (see below), whose sum is σ = 995291399853. Its totient is φ = 725236424640.

The previous prime is 850842052897. The next prime is 850842052933. The reversal of 850842052921 is 129250248058.

The square root of 850842052921 is 922411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 832117962025 + 18724090896 = 912205^2 + 136836^2 .

It is not a de Polignac number, because 850842052921 - 2⁵ = 850842052889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850842053921) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2021002291 + ... + 2021002711.

It is an arithmetic number, because the mean of its divisors is an integer number (36862644439).

Almost surely, 2^850842052921 is an apocalyptic number.

850842052921 is the 922411-st square number.

850842052921 is the 461206-th centered octagonal number.

It is an amenable number.

850842052921 is a deficient number, since it is larger than the sum of its proper divisors (144449346932).

850842052921 is an frugal number, since it uses more digits than its factorization.

850842052921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 850842052921 in words is "eight hundred fifty billion, eight hundred forty-two million, fifty-two thousand, nine hundred twenty-one".