84505421 has 16 divisors (see below), whose sum is σ = 113463168. Its totient is φ = 60782400.

The previous prime is 84505409. The next prime is 84505429. The reversal of 84505421 is 12450548.

It is not a de Polignac number, because 84505421 - 2¹⁰ = 84504397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84505429) 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 15 ways as a sum of consecutive naturals, for example, 41210 + ... + 43211.

It is an arithmetic number, because the mean of its divisors is an integer number (7091448).

Almost surely, 2^84505421 is an apocalyptic number.

It is an amenable number.

84505421 is a deficient number, since it is larger than the sum of its proper divisors (28957747).

84505421 is a wasteful number, since it uses less digits than its factorization.

84505421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84452.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 84505421 is about 9192.6830142239. The cubic root of 84505421 is about 438.8285315445.

Adding to 84505421 its reverse (12450548), we get a palindrome (96955969).

It can be divided in two parts, 84 and 505421, that added together give a palindrome (505505).

The spelling of 84505421 in words is "eighty-four million, five hundred five thousand, four hundred twenty-one".