86840121 has 4 divisors (see below), whose sum is σ = 115786832. Its totient is φ = 57893412.

The previous prime is 86840093. The next prime is 86840137. The reversal of 86840121 is 12104868.

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.

It is not a de Polignac number, because 86840121 - 2¹⁹ = 86315833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86840141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14473351 + ... + 14473356.

It is an arithmetic number, because the mean of its divisors is an integer number (28946708).

Almost surely, 2^86840121 is an apocalyptic number.

It is an amenable number.

86840121 is a deficient number, since it is larger than the sum of its proper divisors (28946711).

86840121 is a wasteful number, since it uses less digits than its factorization.

86840121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28946710.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 86840121 is about 9318.8046980286. The cubic root of 86840121 is about 442.8331660524.

Adding to 86840121 its reverse (12104868), we get a palindrome (98944989).

The spelling of 86840121 in words is "eighty-six million, eight hundred forty thousand, one hundred twenty-one".