84325381821 has 12 divisors (see below), whose sum is σ = 122881236348. Its totient is φ = 55719425664.

The previous prime is 84325381757. The next prime is 84325381859. The reversal of 84325381821 is 12818352348.

84325381821 is a `hidden beast` number, since 8 + 4 + 32 + 538 + 1 + 82 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15174790596 + 69150591225 = 123186^2 + 262965^2 .

It is not a de Polignac number, because 84325381821 - 2⁶ = 84325381757 is a prime.

It is a super-2 number, since 2×84325381821² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84325381121) 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, 41456890 + ... + 41458923.

It is an arithmetic number, because the mean of its divisors is an integer number (10240103029).

Almost surely, 2^84325381821 is an apocalyptic number.

It is an amenable number.

84325381821 is a deficient number, since it is larger than the sum of its proper divisors (38555854527).

84325381821 is a wasteful number, since it uses less digits than its factorization.

84325381821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82915932 (or 82915929 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The spelling of 84325381821 in words is "eighty-four billion, three hundred twenty-five million, three hundred eighty-one thousand, eight hundred twenty-one".