86751780021 has 12 divisors (see below), whose sum is σ = 131903291520. Its totient is φ = 54790597800.

The previous prime is 86751780019. The next prime is 86751780041. The reversal of 86751780021 is 12008715768.

It is a happy number.

It is not a de Polignac number, because 86751780021 - 2¹ = 86751780019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86751780041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253660005 + ... + 253660346.

It is an arithmetic number, because the mean of its divisors is an integer number (10991940960).

Almost surely, 2^86751780021 is an apocalyptic number.

It is an amenable number.

86751780021 is a deficient number, since it is larger than the sum of its proper divisors (45151511499).

86751780021 is a wasteful number, since it uses less digits than its factorization.

86751780021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507320376 (or 507320373 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The spelling of 86751780021 in words is "eighty-six billion, seven hundred fifty-one million, seven hundred eighty thousand, twenty-one".