84502686821 has 12 divisors (see below), whose sum is σ = 99016562988. Its totient is φ = 71902176192.

The previous prime is 84502686817. The next prime is 84502686857. The reversal of 84502686821 is 12868620548.

It can be written as a sum of positive squares in 2 ways, for example, as 50097630625 + 34405056196 = 223825^2 + 185486^2 .

It is not a de Polignac number, because 84502686821 - 2² = 84502686817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84502686821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84502688821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6287246 + ... + 6300671.

It is an arithmetic number, because the mean of its divisors is an integer number (8251380249).

Almost surely, 2^84502686821 is an apocalyptic number.

It is an amenable number.

84502686821 is a deficient number, since it is larger than the sum of its proper divisors (14513876167).

84502686821 is a wasteful number, since it uses less digits than its factorization.

84502686821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12588068 (or 12588061 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 50.

The spelling of 84502686821 in words is "eighty-four billion, five hundred two million, six hundred eighty-six thousand, eight hundred twenty-one".