84459372921 has 64 divisors (see below), whose sum is σ = 157047552000. Its totient is φ = 43580376000.

The previous prime is 84459372917. The next prime is 84459372937. The reversal of 84459372921 is 12927395448.

84459372921 is a `hidden beast` number, since 8 + 4 + 4 + 593 + 7 + 29 + 21 = 666.

It is not a de Polignac number, because 84459372921 - 2² = 84459372917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84459372961) 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 63 ways as a sum of consecutive naturals, for example, 173446 + ... + 446096.

It is an arithmetic number, because the mean of its divisors is an integer number (2453868000).

Almost surely, 2^84459372921 is an apocalyptic number.

It is an amenable number.

84459372921 is a deficient number, since it is larger than the sum of its proper divisors (72588179079).

84459372921 is a wasteful number, since it uses less digits than its factorization.

84459372921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272827 (or 272821 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 84459372921 in words is "eighty-four billion, four hundred fifty-nine million, three hundred seventy-two thousand, nine hundred twenty-one".