86444021 has 2 divisors, whose sum is σ = 86444022. Its totient is φ = 86444020.

The previous prime is 86443993. The next prime is 86444047. The reversal of 86444021 is 12044468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75881521 + 10562500 = 8711^2 + 3250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86444021 is a prime.

It is a Chen prime.

It is equal to p_5022767 and since 86444021 and 5022767 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86444081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43222010 + 43222011.

It is an arithmetic number, because the mean of its divisors is an integer number (43222011).

Almost surely, 2^86444021 is an apocalyptic number.

It is an amenable number.

86444021 is a deficient number, since it is larger than the sum of its proper divisors (1).

86444021 is an equidigital number, since it uses as much as digits as its factorization.

86444021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 86444021 is about 9297.5276821314. The cubic root of 86444021 is about 442.1588479922.

Adding to 86444021 its reverse (12044468), we get a palindrome (98488489).

The spelling of 86444021 in words is "eighty-six million, four hundred forty-four thousand, twenty-one".