86802187721 has 2 divisors, whose sum is σ = 86802187722. Its totient is φ = 86802187720.

The previous prime is 86802187691. The next prime is 86802187733. The reversal of 86802187721 is 12778120868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86222100496 + 580087225 = 293636^2 + 24085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86802187721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86802187721.

It is not a weakly prime, because it can be changed into another prime (86802187321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43401093860 + 43401093861.

It is an arithmetic number, because the mean of its divisors is an integer number (43401093861).

Almost surely, 2^86802187721 is an apocalyptic number.

It is an amenable number.

86802187721 is a deficient number, since it is larger than the sum of its proper divisors (1).

86802187721 is an equidigital number, since it uses as much as digits as its factorization.

86802187721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 602112, while the sum is 50.

The spelling of 86802187721 in words is "eighty-six billion, eight hundred two million, one hundred eighty-seven thousand, seven hundred twenty-one".