84808012921 has 4 divisors (see below), whose sum is σ = 84810320244. Its totient is φ = 84805705600.

The previous prime is 84808012889. The next prime is 84808012973. The reversal of 84808012921 is 12921080848.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52652350521 + 32155662400 = 229461^2 + 179320^2 .

It is a cyclic number.

It is not a de Polignac number, because 84808012921 - 2⁵ = 84808012889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84808013921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097620 + ... + 1172341.

It is an arithmetic number, because the mean of its divisors is an integer number (21202580061).

Almost surely, 2^84808012921 is an apocalyptic number.

It is an amenable number.

84808012921 is a deficient number, since it is larger than the sum of its proper divisors (2307323).

84808012921 is a wasteful number, since it uses less digits than its factorization.

84808012921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307322.

The product of its (nonzero) digits is 73728, while the sum is 43.

The spelling of 84808012921 in words is "eighty-four billion, eight hundred eight million, twelve thousand, nine hundred twenty-one".