86684221 has 8 divisors (see below), whose sum is σ = 94179960. Its totient is φ = 79306752.

The previous prime is 86684183. The next prime is 86684243. The reversal of 86684221 is 12248668.

It can be written as a sum of positive squares in 4 ways, for example, as 2595321 + 84088900 = 1611^2 + 9170^2 .

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 86684221 - 2¹⁹ = 86159933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86684261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28036 + ... + 30973.

It is an arithmetic number, because the mean of its divisors is an integer number (11772495).

Almost surely, 2^86684221 is an apocalyptic number.

It is an amenable number.

86684221 is a deficient number, since it is larger than the sum of its proper divisors (7495739).

86684221 is a wasteful number, since it uses less digits than its factorization.

86684221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59135.

The product of its digits is 36864, while the sum is 37.

The square root of 86684221 is about 9310.4361337158. The cubic root of 86684221 is about 442.5680081030.

The spelling of 86684221 in words is "eighty-six million, six hundred eighty-four thousand, two hundred twenty-one".