84196921 has 4 divisors (see below), whose sum is σ = 84219472. Its totient is φ = 84174372.

The previous prime is 84196901. The next prime is 84196927. The reversal of 84196921 is 12969148.

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 a de Polignac number, because none of the positive numbers 2^k-84196921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84196927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4191 + ... + 13636.

It is an arithmetic number, because the mean of its divisors is an integer number (21054868).

Almost surely, 2^84196921 is an apocalyptic number.

It is an amenable number.

84196921 is a deficient number, since it is larger than the sum of its proper divisors (22551).

84196921 is a wasteful number, since it uses less digits than its factorization.

84196921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22550.

The product of its digits is 31104, while the sum is 40.

The square root of 84196921 is about 9175.8880224205. Note that the first 3 decimals coincide. The cubic root of 84196921 is about 438.2938767834.

The spelling of 84196921 in words is "eighty-four million, one hundred ninety-six thousand, nine hundred twenty-one".