84082821 has 4 divisors (see below), whose sum is σ = 112110432. Its totient is φ = 56055212.

The previous prime is 84082813. The next prime is 84082849. The reversal of 84082821 is 12828048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84082821 - 2³ = 84082813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84082811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14013801 + ... + 14013806.

It is an arithmetic number, because the mean of its divisors is an integer number (28027608).

Almost surely, 2^84082821 is an apocalyptic number.

It is an amenable number.

84082821 is a deficient number, since it is larger than the sum of its proper divisors (28027611).

84082821 is a wasteful number, since it uses less digits than its factorization.

84082821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28027610.

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 84082821 is about 9169.6685327224. The cubic root of 84082821 is about 438.0958016918.

The spelling of 84082821 in words is "eighty-four million, eighty-two thousand, eight hundred twenty-one".