85226021 has 2 divisors, whose sum is σ = 85226022. Its totient is φ = 85226020.

The previous prime is 85225997. The next prime is 85226051. The reversal of 85226021 is 12062258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72165025 + 13060996 = 8495^2 + 3614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85226021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85226051) 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, 42613010 + 42613011.

It is an arithmetic number, because the mean of its divisors is an integer number (42613011).

Almost surely, 2^85226021 is an apocalyptic number.

It is an amenable number.

85226021 is a deficient number, since it is larger than the sum of its proper divisors (1).

85226021 is an equidigital number, since it uses as much as digits as its factorization.

85226021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 85226021 is about 9231.7940293315. The cubic root of 85226021 is about 440.0723383132.

Adding to 85226021 its reverse (12062258), we get a palindrome (97288279).

The spelling of 85226021 in words is "eighty-five million, two hundred twenty-six thousand, twenty-one".