85802021 has 2 divisors, whose sum is σ = 85802022. Its totient is φ = 85802020.

The previous prime is 85801973. The next prime is 85802023. The reversal of 85802021 is 12020858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 4351396 = 9025^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 85802021 - 2⁶ = 85801957 is a prime.

Together with 85802023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85802023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42901010 + 42901011.

It is an arithmetic number, because the mean of its divisors is an integer number (42901011).

Almost surely, 2^85802021 is an apocalyptic number.

It is an amenable number.

85802021 is a deficient number, since it is larger than the sum of its proper divisors (1).

85802021 is an equidigital number, since it uses as much as digits as its factorization.

85802021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 85802021 is about 9262.9380328274. The cubic root of 85802021 is about 441.0615227060.

Adding to 85802021 its reverse (12020858), we get a palindrome (97822879).

It can be divided in two parts, 8580 and 2021, that added together give a palindrome (10601).

The spelling of 85802021 in words is "eighty-five million, eight hundred two thousand, twenty-one".