84271220 has 24 divisors (see below), whose sum is σ = 193058208. Its totient is φ = 30644000.

The previous prime is 84271211. The next prime is 84271223. The reversal of 84271220 is 2217248.

It is a self number, because there is not a number n which added to its sum of digits gives 84271220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84271223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191306 + ... + 191745.

It is an arithmetic number, because the mean of its divisors is an integer number (8044092).

Almost surely, 2^84271220 is an apocalyptic number.

It is an amenable number.

84271220 is an abundant number, since it is smaller than the sum of its proper divisors (108786988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84271220 is a wasteful number, since it uses less digits than its factorization.

84271220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383071 (or 383069 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 84271220 is about 9179.9357296225. The cubic root of 84271220 is about 438.4227620292.

Adding to 84271220 its reverse (2217248), we get a palindrome (86488468).

The spelling of 84271220 in words is "eighty-four million, two hundred seventy-one thousand, two hundred twenty".