86404221 has 6 divisors (see below), whose sum is σ = 124806110. Its totient is φ = 57602808.

The previous prime is 86404193. The next prime is 86404247. The reversal of 86404221 is 12240468.

It can be written as a sum of positive squares in only one way, i.e., 61544025 + 24860196 = 7845^2 + 4986^2 .

It is not a de Polignac number, because 86404221 - 2⁷ = 86404093 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 (86404321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4800226 + ... + 4800243.

Almost surely, 2^86404221 is an apocalyptic number.

It is an amenable number.

86404221 is a deficient number, since it is larger than the sum of its proper divisors (38401889).

86404221 is a wasteful number, since it uses less digits than its factorization.

86404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9600475 (or 9600472 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 86404221 is about 9295.3870817734. The cubic root of 86404221 is about 442.0909789312.

Adding to 86404221 its reverse (12240468), we get a palindrome (98644689).

The spelling of 86404221 in words is "eighty-six million, four hundred four thousand, two hundred twenty-one".