86491021321 has 2 divisors, whose sum is σ = 86491021322. Its totient is φ = 86491021320.

The previous prime is 86491021241. The next prime is 86491021403. The reversal of 86491021321 is 12312019468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78434163721 + 8056857600 = 280061^2 + 89760^2 .

It is a cyclic number.

It is not a de Polignac number, because 86491021321 - 2¹¹ = 86491019273 is a prime.

It is not a weakly prime, because it can be changed into another prime (86491021921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43245510660 + 43245510661.

It is an arithmetic number, because the mean of its divisors is an integer number (43245510661).

Almost surely, 2^86491021321 is an apocalyptic number.

It is an amenable number.

86491021321 is a deficient number, since it is larger than the sum of its proper divisors (1).

86491021321 is an equidigital number, since it uses as much as digits as its factorization.

86491021321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 86491021321 in words is "eighty-six billion, four hundred ninety-one million, twenty-one thousand, three hundred twenty-one".