84421111 has 4 divisors (see below), whose sum is σ = 84721824. Its totient is φ = 84120400.

The previous prime is 84421097. The next prime is 84421151. The reversal of 84421111 is 11112448.

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

It is a cyclic number.

It is not a de Polignac number, because 84421111 - 2¹⁷ = 84290039 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84421151) 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, 149935 + ... + 150496.

It is an arithmetic number, because the mean of its divisors is an integer number (21180456).

Almost surely, 2^84421111 is an apocalyptic number.

84421111 is a deficient number, since it is larger than the sum of its proper divisors (300713).

84421111 is a wasteful number, since it uses less digits than its factorization.

84421111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300712.

The product of its digits is 256, while the sum is 22.

The square root of 84421111 is about 9188.0961575290. The cubic root of 84421111 is about 438.6825450744.

Adding to 84421111 its reverse (11112448), we get a palindrome (95533559).

The spelling of 84421111 in words is "eighty-four million, four hundred twenty-one thousand, one hundred eleven".