86118021 has 12 divisors (see below), whose sum is σ = 135701280. Its totient is φ = 52192680.

The previous prime is 86118017. The next prime is 86118041. The reversal of 86118021 is 12081168.

It is not a de Polignac number, because 86118021 - 2² = 86118017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86118001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434841 + ... + 435038.

It is an arithmetic number, because the mean of its divisors is an integer number (11308440).

Almost surely, 2^86118021 is an apocalyptic number.

It is an amenable number.

86118021 is a deficient number, since it is larger than the sum of its proper divisors (49583259).

86118021 is a wasteful number, since it uses less digits than its factorization.

86118021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869896 (or 869893 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 86118021 is about 9279.9795797189. The cubic root of 86118021 is about 441.6023207237.

Adding to 86118021 its reverse (12081168), we get a palindrome (98199189).

The spelling of 86118021 in words is "eighty-six million, one hundred eighteen thousand, twenty-one".