84318181821 has 8 divisors (see below), whose sum is σ = 124915824960. Its totient is φ = 56212121196.

The previous prime is 84318181781. The next prime is 84318181853. The reversal of 84318181821 is 12818181348.

84318181821 is a `hidden beast` number, since 84 + 318 + 181 + 82 + 1 = 666.

It is not a de Polignac number, because 84318181821 - 2¹⁰ = 84318180797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84318181921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1561447785 + ... + 1561447838.

It is an arithmetic number, because the mean of its divisors is an integer number (15614478120).

Almost surely, 2^84318181821 is an apocalyptic number.

It is an amenable number.

84318181821 is a deficient number, since it is larger than the sum of its proper divisors (40597643139).

84318181821 is a wasteful number, since it uses less digits than its factorization.

84318181821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122895632 (or 3122895626 counting only the distinct ones).

The product of its digits is 98304, while the sum is 45.

The spelling of 84318181821 in words is "eighty-four billion, three hundred eighteen million, one hundred eighty-one thousand, eight hundred twenty-one".