84657221 has 8 divisors (see below), whose sum is σ = 94849824. Its totient is φ = 74880720.

The previous prime is 84657211. The next prime is 84657253. The reversal of 84657221 is 12275648.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84657221 - 2²⁶ = 17548357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84657211) 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, 103595 + ... + 104408.

It is an arithmetic number, because the mean of its divisors is an integer number (11856228).

Almost surely, 2^84657221 is an apocalyptic number.

It is an amenable number.

84657221 is a deficient number, since it is larger than the sum of its proper divisors (10192603).

84657221 is a wasteful number, since it uses less digits than its factorization.

84657221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208051.

The product of its digits is 26880, while the sum is 35.

The square root of 84657221 is about 9200.9358763117. The cubic root of 84657221 is about 439.0911353039.

The spelling of 84657221 in words is "eighty-four million, six hundred fifty-seven thousand, two hundred twenty-one".