86312021 has 2 divisors, whose sum is σ = 86312022. Its totient is φ = 86312020.

The previous prime is 86311993. The next prime is 86312047. The reversal of 86312021 is 12021368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86304100 + 7921 = 9290^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 86312021 - 2⁶ = 86311957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86312321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43156010 + 43156011.

It is an arithmetic number, because the mean of its divisors is an integer number (43156011).

Almost surely, 2^86312021 is an apocalyptic number.

It is an amenable number.

86312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

86312021 is an equidigital number, since it uses as much as digits as its factorization.

86312021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 86312021 is about 9290.4263088407. The cubic root of 86312021 is about 441.9336745206.

Adding to 86312021 its reverse (12021368), we get a palindrome (98333389).

The spelling of 86312021 in words is "eighty-six million, three hundred twelve thousand, twenty-one".