86012821 has 2 divisors, whose sum is σ = 86012822. Its totient is φ = 86012820.

The previous prime is 86012819. The next prime is 86012833. The reversal of 86012821 is 12821068.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53363025 + 32649796 = 7305^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 86012821 - 2¹ = 86012819 is a prime.

Together with 86012819, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 86012821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86012851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43006410 + 43006411.

It is an arithmetic number, because the mean of its divisors is an integer number (43006411).

Almost surely, 2^86012821 is an apocalyptic number.

It is an amenable number.

86012821 is a deficient number, since it is larger than the sum of its proper divisors (1).

86012821 is an equidigital number, since it uses as much as digits as its factorization.

86012821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 86012821 is about 9274.3097317267. The cubic root of 86012821 is about 441.4224300216.

Adding to 86012821 its reverse (12821068), we get a palindrome (98833889).

The spelling of 86012821 in words is "eighty-six million, twelve thousand, eight hundred twenty-one".