84034821521 has 4 divisors (see below), whose sum is σ = 96039796032. Its totient is φ = 72029847012.

The previous prime is 84034821503. The next prime is 84034821551. The reversal of 84034821521 is 12512843048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84034821521 - 2¹⁰ = 84034820497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84034821551) 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 3 ways as a sum of consecutive naturals, for example, 6002487245 + ... + 6002487258.

It is an arithmetic number, because the mean of its divisors is an integer number (24009949008).

Almost surely, 2^84034821521 is an apocalyptic number.

It is an amenable number.

84034821521 is a deficient number, since it is larger than the sum of its proper divisors (12004974511).

84034821521 is a wasteful number, since it uses less digits than its factorization.

84034821521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12004974510.

The product of its (nonzero) digits is 61440, while the sum is 38.

The spelling of 84034821521 in words is "eighty-four billion, thirty-four million, eight hundred twenty-one thousand, five hundred twenty-one".