85336021 has 2 divisors, whose sum is σ = 85336022. Its totient is φ = 85336020.

The previous prime is 85335983. The next prime is 85336057. The reversal of 85336021 is 12063358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46771921 + 38564100 = 6839^2 + 6210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85336021 is a prime.

It is a super-2 number, since 2×85336021² = 14564472960224882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85336081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42668010 + 42668011.

It is an arithmetic number, because the mean of its divisors is an integer number (42668011).

Almost surely, 2^85336021 is an apocalyptic number.

It is an amenable number.

85336021 is a deficient number, since it is larger than the sum of its proper divisors (1).

85336021 is an equidigital number, since it uses as much as digits as its factorization.

85336021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 85336021 is about 9237.7497801142. The cubic root of 85336021 is about 440.2615885957.

Adding to 85336021 its reverse (12063358), we get a palindrome (97399379).

The spelling of 85336021 in words is "eighty-five million, three hundred thirty-six thousand, twenty-one".