86840784221 has 4 divisors (see below), whose sum is σ = 86841373632. Its totient is φ = 86840194812.

The previous prime is 86840784167. The next prime is 86840784253. The reversal of 86840784221 is 12248704868.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 86840784221 - 2¹⁸ = 86840522077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86840784221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86840724221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142550 + ... + 440456.

It is an arithmetic number, because the mean of its divisors is an integer number (21710343408).

Almost surely, 2^86840784221 is an apocalyptic number.

It is an amenable number.

86840784221 is a deficient number, since it is larger than the sum of its proper divisors (589411).

86840784221 is a wasteful number, since it uses less digits than its factorization.

86840784221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589410.

The product of its (nonzero) digits is 1376256, while the sum is 50.

The spelling of 86840784221 in words is "eighty-six billion, eight hundred forty million, seven hundred eighty-four thousand, two hundred twenty-one".