84221221 has 4 divisors (see below), whose sum is σ = 96252832. Its totient is φ = 72189612.

The previous prime is 84221209. The next prime is 84221231. The reversal of 84221221 is 12212248.

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 not a de Polignac number, because 84221221 - 2²³ = 75832613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84221192 and 84221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84221231) 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 3 ways as a sum of consecutive naturals, for example, 6015795 + ... + 6015808.

It is an arithmetic number, because the mean of its divisors is an integer number (24063208).

Almost surely, 2^84221221 is an apocalyptic number.

It is an amenable number.

84221221 is a deficient number, since it is larger than the sum of its proper divisors (12031611).

84221221 is a wasteful number, since it uses less digits than its factorization.

84221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12031610.

The product of its digits is 512, while the sum is 22.

The square root of 84221221 is about 9177.2120494189. The cubic root of 84221221 is about 438.3360379322.

Adding to 84221221 its reverse (12212248), we get a palindrome (96433469).

The spelling of 84221221 in words is "eighty-four million, two hundred twenty-one thousand, two hundred twenty-one".