846847581921 has 12 divisors (see below), whose sum is σ = 1334426492880. Its totient is φ = 513240958680.

The previous prime is 846847581919. The next prime is 846847581941. The reversal of 846847581921 is 129185748648.

846847581921 is a `hidden beast` number, since 8 + 4 + 6 + 8 + 47 + 581 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 846847581921 - 2¹ = 846847581919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (846847581941) 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, 4277007891 + ... + 4277008088.

It is an arithmetic number, because the mean of its divisors is an integer number (111202207740).

Almost surely, 2^846847581921 is an apocalyptic number.

It is an amenable number.

846847581921 is a deficient number, since it is larger than the sum of its proper divisors (487578910959).

846847581921 is a wasteful number, since it uses less digits than its factorization.

846847581921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8554015996 (or 8554015993 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 846847581921 in words is "eight hundred forty-six billion, eight hundred forty-seven million, five hundred eighty-one thousand, nine hundred twenty-one".