86688286921 has 2 divisors, whose sum is σ = 86688286922. Its totient is φ = 86688286920.

The previous prime is 86688286907. The next prime is 86688286931. The reversal of 86688286921 is 12968288668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70915690000 + 15772596921 = 266300^2 + 125589^2 .

It is a cyclic number.

It is not a de Polignac number, because 86688286921 - 2⁷ = 86688286793 is a prime.

It is not a weakly prime, because it can be changed into another prime (86688286931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43344143460 + 43344143461.

It is an arithmetic number, because the mean of its divisors is an integer number (43344143461).

Almost surely, 2^86688286921 is an apocalyptic number.

It is an amenable number.

86688286921 is a deficient number, since it is larger than the sum of its proper divisors (1).

86688286921 is an equidigital number, since it uses as much as digits as its factorization.

86688286921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31850496, while the sum is 64.

The spelling of 86688286921 in words is "eighty-six billion, six hundred eighty-eight million, two hundred eighty-six thousand, nine hundred twenty-one".