85286021 has 2 divisors, whose sum is σ = 85286022. Its totient is φ = 85286020.

The previous prime is 85286017. The next prime is 85286023. The reversal of 85286021 is 12068258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84456100 + 829921 = 9190^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 85286021 - 2² = 85286017 is a prime.

Together with 85286023, 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 (85286023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42643010 + 42643011.

It is an arithmetic number, because the mean of its divisors is an integer number (42643011).

Almost surely, 2^85286021 is an apocalyptic number.

It is an amenable number.

85286021 is a deficient number, since it is larger than the sum of its proper divisors (1).

85286021 is an equidigital number, since it uses as much as digits as its factorization.

85286021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 85286021 is about 9235.0430968134. The cubic root of 85286021 is about 440.1755859133.

The spelling of 85286021 in words is "eighty-five million, two hundred eighty-six thousand, twenty-one".