85006021 has 2 divisors, whose sum is σ = 85006022. Its totient is φ = 85006020.

The previous prime is 85006007. The next prime is 85006063. The reversal of 85006021 is 12060058.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66601921 + 18404100 = 8161^2 + 4290^2 .

It is a cyclic number.

It is not a de Polignac number, because 85006021 - 2¹¹ = 85003973 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 85005983 and 85006001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85006081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42503010 + 42503011.

It is an arithmetic number, because the mean of its divisors is an integer number (42503011).

Almost surely, 2^85006021 is an apocalyptic number.

It is an amenable number.

85006021 is a deficient number, since it is larger than the sum of its proper divisors (1).

85006021 is an equidigital number, since it uses as much as digits as its factorization.

85006021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 85006021 is about 9219.8709860822. The cubic root of 85006021 is about 439.6933486615.

Adding to 85006021 its reverse (12060058), we get a palindrome (97066079).

The spelling of 85006021 in words is "eighty-five million, six thousand, twenty-one".