65086821 has 24 divisors (see below), whose sum is σ = 99779680. Its totient is φ = 42375312.

The previous prime is 65086793. The next prime is 65086841. The reversal of 65086821 is 12868056.

It is a happy number.

65086821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65086821 - 2⁹ = 65086309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65086841) 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 in 23 ways as a sum of consecutive naturals, for example, 7335 + ... + 13563.

Almost surely, 2^65086821 is an apocalyptic number.

It is an amenable number.

65086821 is a deficient number, since it is larger than the sum of its proper divisors (34692859).

65086821 is an equidigital number, since it uses as much as digits as its factorization.

65086821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6287 (or 6275 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 65086821 is about 8067.6403613448. The cubic root of 65086821 is about 402.2515133573.

The spelling of 65086821 in words is "sixty-five million, eighty-six thousand, eight hundred twenty-one".