86434221 has 16 divisors (see below), whose sum is σ = 117338624. Its totient is φ = 56582064.

The previous prime is 86434217. The next prime is 86434223. The reversal of 86434221 is 12243468.

It is not a de Polignac number, because 86434221 - 2² = 86434217 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 (86434223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97446 + ... + 98328.

It is an arithmetic number, because the mean of its divisors is an integer number (7333664).

Almost surely, 2^86434221 is an apocalyptic number.

It is an amenable number.

86434221 is a deficient number, since it is larger than the sum of its proper divisors (30904403).

86434221 is a wasteful number, since it uses less digits than its factorization.

86434221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440.

The product of its digits is 9216, while the sum is 30.

The square root of 86434221 is about 9297.0006453695. Note that the first 3 decimals coincide. The cubic root of 86434221 is about 442.1421384484.

Adding to 86434221 its reverse (12243468), we get a palindrome (98677689).

The spelling of 86434221 in words is "eighty-six million, four hundred thirty-four thousand, two hundred twenty-one".